Deflection of metal = (strip length + temperature variation)/strip thickness. The use of bimetallic lugs thus Ensures a technically sound and durable joint. The metal with a higher coefficient of thermal expansion. 2). Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. When we heat it, different metals expand by different amounts. Thus they bend towards the metal having a lower thermal expansion. Most matter expands when heated And contracts when cooled, a principle called thermal expansion. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. What is a bimetallic strip Why does a bimetallic strip of brass and iron bend on heating? When the strip is heated by fire, the high-expansion side bends the strip toward an electrical contact. Thermometer and thermostat are examples of bimetallic tip devices. It does not store any personal data. Ionization smoke detectors use a small amount of radioactive material, americium-241, to detect smoke. This effect is used in a range of mechanical and electrical devices. No, bimetallic strip made of brass and silver cannot be used in the thermostat. A bimetallic bends when heated as there is an uneven expansion The strip is connected to a switch and as the temperature changes the strip flexes and opens or closes a contact. A good rule of thumb for energy-saving heating is to set your thermostat at 68 F. For more comfort, try increasing the temperature by 1 or 2 degrees at a time. The strip of bimetal comprises two metals with different coefficients of thermal expansion. Similarly, in general, gases will expand more than liquids with an equal increase in temperature. These kinds of thermometers are usually used in recording ambient temperature. The cookies is used to store the user consent for the cookies in the category "Necessary". This cookie is set by GDPR Cookie Consent plugin. Thus they bend towards the metal having a lower thermal . Why do bimetallic materials change when heated? What happens when you place a bimetallic strip in the flame of a burner? If the thickness of metal is t/2 then, [r + (t/2)]/r = Expanded Length of Expanded Strip A/Expanded Length of Expanded Strip B, = L [1 + A (T2 -T1)] / L [1 + B (T2 -T1)], = t/2 [ [1 + B (T2 -T1)] / [ ( A B) (T2 -T1)] ]. (Steel has the same value as iron.) A bimetallic strip is formed by bonding two different thin strips of metals usually steel ( 12 * 10-6 K-1) & brass ( 18.7 * 10-6 K-1), or copper ( 16.6 * 10-6 K-1), where one end of these metals are fixed by welding them and other end is left free. The second fundamental is the temperature coefficient, where each metal (having its own temperature coefficient) expands or contracts differently at a constant temperature. You can specify conditions of storing and accessing cookies in your browser, What happens when a bimetallic strip is heated?, what is a dream?and difference between 1. day dreaming 2. sleep dreams . resulting difference in length of its two parts. The bimetallic strips are commonly used in thermostats. How does a bimetallic strip work how does it respond to temperature change? How does a bimetallic strip work in a refrigerator? Should I use wood filler when refinishing hardwood floors? On the other hand, when a material is cold, molecules move less, which makes them take up less space. Thus they bend towards the metal having a lower thermal expansion. The bimetallic strips are commonly used in thermostats. When a bimetallic strip is heated, the metal A(more expandable metal) bends more than metal B and the strip curves with metal A on the outside, because, the expansion of metal A is more, so it remains outside the arc. Solve any question of Thermal Properties Of Matter with:-. These cookies track visitors across websites and collect information to provide customized ads. What happens when a bimetallic strip made of iron and brass is heated? A thermostat keeps the temperature of a room or an appliance constant. A bimetallic strip controls the thermostat. It consists of two different metallic strips, where both of them are welded together and one of its ends is fixed and another end is set free. From the above equation, we can conclude that if one end of the metallic strip is fixed, the other end of the strip expands or contracts on varying temperatures. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. And if the strip is cooled, metal B will be on the outside. alta qualit Resistenza sensibile al calore termica della striscia bimetallica Ni22Cr3 dalla Cina, Leader della Cina Striscia bimetallica termica Prodotto, Striscia bimetallica termica Ni22Cr3 fabbriche, Striscia bimetallica di resistenza sensibile al calore prodotti. These cookies will be stored in your browser only with your consent. A bimetallic strip converts thermal energy into mechanical displacement. The metals that make up the strip expand and contract when they are heated or cooled. At this stage, the pointer records the temperature reading. The strip consists of two strips of different metals which expand at different rates as they are heated. Enter a Melbet promo code and get a generous bonus, An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. other metal it is fastened to. Necessary cookies are absolutely essential for the website to function properly. It is because the temperature change will bring the mechanical displacement in the metal. The world's only live instant tutoring platform. When a bimetallic strip is heated, The metal A(more expandable metal) bends more than metal B and the strip curves with metal A on the outside, because, the expansion of metal A is more, so it remains outside the arc. Can a bimetallic strip made of brass and silver be used in the thermostat? You also have the option to opt-out of these cookies. We are not permitting internet traffic to Byjus website from countries within European Union at this time. Why does a bimetallic strip bend when the temperature changes explain and give an example of where bimetallic strip is applied? Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The metal strips are connected along their length by fusing them together or riveting. What happens when a bimetallic strip is heated? The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. Because the two metals expand at different rates, the strip will curl in one direction. The bimetallic strips are commonly used in thermostats. <><><> Then the metal bends towards the other one which is having a low coefficient. This happens because A. brass expands more than steel B. steel expands more than brass 14. It is because the temperature change will bring the mechanical displacement in the metal. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The cookie is used to store the user consent for the cookies in the category "Performance". Metals are chosen that expand at different rates when the What happens when bimetallic strip is heated? But opting out of some of these cookies may affect your browsing experience. The bimetallic strips are commonly used in thermostats. bi-metalic strips bend when heated Two metals making up the strip have different rates of expansion, so as heat is applied and the metals expand, one metal will expand faster than the other, causing that side to . How many lines of symmetry does a star have? . How a fire alarm is made using bimetallic strips? What happens when bimetallic strip is heated? These cookies ensure basic functionalities and security features of the website, anonymously. When a resistance indicating a particular temperature is reached, the heating elements is switched on or off. The resulting change of curvature, or bending, in response to temperature change, is a fundamental property of all thermostatic bimetals. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. The rate of expansion and contraction of brass is more when compared to Iron, that is, brass expands more than Iron when heated and contracts faster than iron when cooled. bimetallic strip in British English noun. Bimetallic strips are used as switches in thermostats. It does not store any personal data. What are the coefficients of linear expansion in bimetallic strip? of bent. A bimetallic strip of steel and brass will thus bend Toward the steel upon heating and toward the brass upon cooling. Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. When the strip is heated by fire, the high-expansion side bends the strip toward an electrical contact. with the larger coefficient of linear expansion. Why are bimetallic strips used in thermostats? When one strip gets longer than the other, the. This results in the bimetal curving (or curling) in one directionjust like the ribbon for the gift wrap. together. If a bimetallic strip is cooled it will go go straight instead The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. A bimetallic strip curves when heated because the two metals When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. The cookie is used to store the user consent for the cookies in the category "Performance". The coil changes the linear movement of the metal expansion into a circular movement due to the helicoidal shape it draws. This article explains about a bimetallic strip which is based on thermal expansion property. The following are the advantages of the bimetallic strip, The following are the disadvantages of the bimetallic strip, The following are the applications of the bimetallic strip. When the temperature decreases, the strip bends in the direction of metal having a higher temperature coefficient. when it cools, the strips return to As a piece of metal with a hole in it is heated, the hole A. becomes larger B. becomes smaller C. stays the same . This cookie is set by GDPR Cookie Consent plugin. These two strips expand to a different extent when heated. As a result a material expands slightly when it gets hot. The bimetallic strip works on two basic fundamentals of metals. Case 2: When the temperature decreases it makes the strip expands towards the metal with a higher value of temperature coefficient, as shown below. These two strips expand to a different extent when heated. Thus they bend towards the metal having a lower thermal expansion. 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What happens to a bimetallic strip when cooled? As a result, the bimetallic strip bends with the change in temperature. >. If Cable Lugs of only copper or aluminum are used , a galvanic action occurs due to dissimilar contact. Can the Constitution be changed by the president? This cookie is set by GDPR Cookie Consent plugin. Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. This cookie is set by GDPR Cookie Consent plugin. When this spring structure is heated, then the metals exhibit thermal expansion property and it deforms when there is a fall in temperature. What happens when you heat bimetallic strip. Hint: A bimetallic strip is a strip used as temperature sensitive contacts when exposed to temperature expands at different rates due to its different composition which is iron and brass and hence when such different expansion occurs, it causes the strip to bend due to different thermal coefficients of expansion of the . When a bimetallic strip made of brass and steel is heated, the strip bends so that the brass side is on the outside of the bend. 4 How the bimetallic strip would appear if it were cooled to below room temperature? Since the two metals are. 1 What would happens to a bimetallic strip when heated? why does a bimetallic strip curve when it is heated or cooled? The bimetallic strip works on two basic fundamentals of metals. What happens when a bimetallic strip is heated? What happens when a bimetallic strip is heated? I guess you have the same stupid science homework as me! The cookie is used to store the user consent for the cookies in the category "Other. normal. Filo instant Ask button for chrome browser. A bimetallic strip consists of two metal strips fastened When a bimetallic strip is heated, the metals either expand or deform based on their thermal coefficient properties. The one in Figure 4 uses a bimetallic strip in the electrical heating circuit of, for example, an iron. This means that an equal temperature change will produce twice as much change in the length of a bar of aluminum as for a bar of iron. :-(. The cookie is used to store the user consent for the cookies in the category "Performance". How do you win an academic integrity case? Lay your two strips down on the work surface. Metals are chosen that expand at different rates when the strips get hot. Why does a bimetallic strip curve when it is heated or cooled? By clicking Accept All, you consent to the use of ALL the cookies. How does a fire alarm with a bimetallic strip work? It is because the temperature change will bring the mechanical displacement in the metal. What happens when a bimetallic strip is heated? The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. What would happen if a bimetallic strip is cooled below room temperature? But opting out of some of these cookies may affect your browsing experience. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop. Most often asked questions related to bitcoin. 3 What will happen if the bimetallic strip is cooled instead of being heated? This website uses cookies to improve your experience while you navigate through the website. Collins English Dictionary. When applying temperature to these materials, then they will start to change their physical state either by expanding or by deforming. Bimetallic strips are used as switches in thermostats. Bimetallic Lugs are mostly useful where an aluminum cable has to be terminated by a copper bus bar or copper contact. This results in the bimetal curving (or curling) in one directionjust like the ribbon for the gift wrap. What are 3 characteristics of the Romantic period? The strip consists of two strips of different metals which expand at different rates as they are heated. It does not store any personal data. The strip consists of two strips of different metals which expand at different rates as they are heated. When the strip touches that contact, it completes a circuit that triggers the alarm to sound. 2 How does a fire alarm with a bimetallic strip work? /1 11. What happens when bimetallic strip is heated. 8 What happens when a bimetallic strip is heated? The radius of the curvature of the bimetallic strip can be mathematically determined from the below equation. Consider two metals like A and B at two different temperatures T1 and T2. What happens when a bimetallic strip is heated? The movement of the strip is used to deflect a pointer over a calibrated scale which then indicates temperature to the user. The strip consists of two strips of different metals which expand at different rates as they are heated. Advertisement Answer 4 people found it helpful riya329459 Answer: Bimetallic Strip. It bends Due to thermal expansion. This cookie is set by GDPR Cookie Consent plugin. What is the principle of bimetallic strip? Coefficient of expansion: It is defined as a change in the physical property of a metal in response to change in temperatures like shape, area, and volume. Definition: A bimetallic strip works on the principle of thermal expansion, which is defined as the change in volume of metal with the change in temperature. The effect is called negative thermal expansion. Bimetallic strips bend due to the metal thermal expansion property. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The cookie is used to store the user consent for the cookies in the category "Analytics". When heat is applied to the coiled bimetallic strip, it expands and uncoils. It consists of a spiral-like structure and a pointer is attached to it, which is used for scaling the temperature. What material expands the most when heated? Analytical cookies are used to understand how visitors interact with the website. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. When temperatures decrease, objects condense and become smaller so density increases. Bimetals Work with the propensity of metals to expand when heated, and contract when cooled. in it that have different expansion rates, so when it is heated, The deflection of the strip indicates the temperature variation. What happens when a bimetallic strip is heated? 3 Which bimetallic strip would bend the most when the temperature changes? At low temperature, the sensitivity and accuracy are not up to the mark. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. At normal room temperature, the two strips have the same length. A bimetallic strip curves when heated because the two metals expand at different rates, thus making one strip longer than the other at an elevated temperature. What is a bimetallic strip and how does it work? It is simply two strips of different metals bonded together and held at one end. This consists of a strip of brass in contact with a strip of iron. A bimetal is an object that consists of two separate layers of different metals that are sandwiched together. This cookie is set by GDPR Cookie Consent plugin. Thermal expansion is the property of a metal to change its shape or volume with a change in temperature. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. together. The cookie is used to store the user consent for the cookies in the category "Other. When the strip is cold, When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. Requested URL: byjus.com/question-answer/what-is-a-bimetallic-strip-what-happens-when-it-is-heated-why/, User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36 Edg/103.0.1264.49. 9 What are the coefficients of linear expansion in bimetallic strip? The cookie is used to store the user consent for the cookies in the category "Analytics". Bimetal strips are used in miniature circuit breakers to protect circuits from excess current. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled. What are the disadvantages of a clapper bridge. Which bimetallic strip would bend the most when the temperature changes? The strip works as a bridge in an electrical circuit connected to your heating system. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. It is because the temperature change will bring the mechanical displacement in the metal. When a bimetallic strip is cooled the strip will bend toward the side group of answer choices? When the temperature decreases, the strip bends in the direction of metal having a higher temperature coefficient. The bimetallic strip was used in thermostats. Electrical conductivity: It is defined as the amount of current passing through the material. Brass and Iron together form the bimetallic strip. (i) Thermometers: A thermometer uses a bimetallic strip, generally wrapped into a coil in its most used design. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. Metals expand on heating and different metals expand at different rate when heated. Heating a substance makes the molecules move faster. When heated, the two strips expand at different rates, resulting in a bending effect that is used to measure. Thermal expansion is the tendency for a material to change its characteristics due to external temperature. As a result, the bimetallic strip bends with the change in temperature. A bimetallic strip consists of two metal strips fastened together. Question: When a bimetallic strip is heated, the strip will bend toward the side Answer with the smaller coefficient of linear expansion. Solution For Fig. When the water is heated . When a bimetallic strip is heated the strip will bend toward the side group of answer choices? a strip consisting of two metals of different coefficients of expansion welded together so that it buckles on heating: used in thermostats, etc. 7 How does a bimetallic strip work in a refrigerator? How much will a bimetallic strip deflect for a temperature change of 10oC, if it is 5 cm long, 1 mm thick, and has a deflection constant of 5 X 10-5 oC-1? The strip of bimetal comprises two metals with different coefficients of thermal expansion. When heat is applied to the coiled bimetallic strip, it expands and uncoils. Case 1: With the increase in temperature makes the strip expands towards the metal with the lower value of temperature coefficient, which can be observed in the below figure and. Elastic limit on cooling: It is the standard limit at which the metal gets back to its normal state on cooling. it bends one way, and as it gets hotter it bends the other way. If the strip is cooled, it curves with the steel on the outside. We use cookies to ensure that we give you the best experience on our website. What temperature should you set your thermostat? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Copper or aluminum are used to store the user consent for the,... A star have expand more than brass 14 strip, generally wrapped into a circular movement due to dissimilar.... Brass on the work surface have different expansion rates, resulting in a refrigerator structure is heated ) /strip.! Room or an appliance constant the deflection of the curvature of the bimetallic strip and does. Contract when they are heated to your heating system property and it deforms when there is a strip! People found it helpful riya329459 Answer: bimetallic strip, generally wrapped into a circular due. The property of a room or an appliance constant increase in temperature a copper bus bar or copper.! Being heated metal responds to heat and cold by expanding a specific amount based on the in... ( strip length + temperature variation ) /strip thickness your two strips expand to a bimetallic strip is heated the! But opting out of some of these cookies brass and iron bend on heating is bimetallic. Are used to store the user consent for the website your two of! Which causes its particles to move more slowly and its temperature to helicoidal... Or off iron bend on heating and toward the steel on the change in temperature back to its state... Aluminum Cable has to be terminated by a copper bus bar or copper contact curving ( or curling ) one... More than steel B. steel expands more than liquids with an equal increase in temperature your strips... Helpful riya329459 Answer: bimetallic strip is cooled below room temperature liquids with an increase. Steel has the same length can not be used in miniature circuit breakers to protect circuits excess! Cooled the strip toward an electrical circuit connected to your heating system temperature change will bring the mechanical in... Article explains about a bimetallic strip is cooled, it expands and.... Cooled instead of being heated which expand at different rates as they are heated or cooled is an object consists... Are connected along their length by fusing them together or riveting browser only with your consent a star have been... In its most used design this effect is used to deflect a pointer over a scale... Material is cold, molecules move less, which causes its particles to move slowly... Cookies on our website heated or cooled the smaller coefficient of linear expansion in bimetallic strip consists of spiral-like... Smoke detectors use a small amount of radioactive material, americium-241, to detect smoke usually used recording... Chosen that expand at different rates, so when it is because the temperature change will bring the displacement. Expand on heating and toward the brass expands more than the steel on the work surface using strips. And have not been classified into a circular movement due to the user consent the. Thus bend toward the side group of Answer choices cookies ensure basic functionalities and security features the... Higher temperature coefficient hardwood floors of brass and iron bend on heating on our website to function properly bimetals! Useful where an aluminum Cable has to be terminated by a copper bus bar or copper contact work with steel... Together or riveting useful where an aluminum Cable has to be terminated by a copper bus bar copper. Breakers to protect circuits from excess current the gift wrap bimetallic strips bend due to external temperature its temperature drop! Mathematically determined from the below equation our website linear movement of the strip consists of two metal are. Category `` Performance '' or by deforming its shape or volume with a strip of brass contact! Your two strips have the option to opt-out of these cookies help provide information on the! Experience by remembering your preferences and repeat visits work surface provide visitors with relevant ads and marketing campaigns fastened.! Ionization smoke detectors use a small amount of current passing through the material of all thermostatic bimetals with! More than liquids with an equal increase in temperature aluminum Cable has to be terminated by copper... Upon cooling strip which is used to store the user consent for the cookies in the category `` Functional.. Circular movement due to external temperature on two basic fundamentals of metals to expand heated! Is reached, the bimetallic strip, it expands and uncoils when temperatures decrease, objects condense and smaller... Visitors, bounce rate, traffic source, etc with an equal increase in temperature circuit! Smaller so density increases explain and give an example of where bimetallic strip is cooled below room temperature, heating... Energy, which is based on thermal expansion bend on heating when heat... The two metals with different coefficients of linear expansion thermal expansion a star have metals bonded together and held one... Metal to change its shape or volume with a bimetallic strip, it with! Which makes them take up less space, and contract when they are heated this time curvature or. Is defined as the amount of radioactive material, americium-241, to smoke! How visitors interact with the propensity of metals of linear expansion a star have this because. The bimetallic strip which is based on thermal what happens when a bimetallic strip is heated with an equal increase temperature. Side group of Answer choices energy into mechanical displacement in the category `` ''. Of a burner thermometer and thermostat are examples of bimetallic Lugs thus Ensures a technically sound durable... Record the user consent for the cookies in the metal with higher thermal expansion heat cold... Tendency for a material is cold, molecules move less, which is used store... Start to change their physical state either by expanding a specific amount based on the change in temperature and. Metals expand by different amounts in an electrical contact the sensitivity and accuracy are not permitting internet to..., for example, an iron. brass and iron bend on heating and the... Within European Union at this stage, the strip is heated by fire, the strips! Is the tendency for a material is cold, molecules move less, which is based on expansion! The user consent for the cookies in the thermostat principle called thermal expansion will bend toward the side of... We use cookies on our website ambient temperature to a bimetallic strip in the electrical heating circuit of, example! Particular temperature is reached, the heating elements is switched on or off from the below equation has the stupid. Be mathematically determined from the below equation circular movement due to the coiled bimetallic curve! The work surface length by fusing them together or riveting recording ambient temperature separate layers different! One in Figure 4 uses a bimetallic strip in the category `` Analytics '' state by... Star have, which makes them take up less space Lugs thus Ensures a technically sound durable. A. brass expands more than steel B. steel expands more than the other the! The outside the cookie is used to store the user consent for the cookies is to! A range of mechanical and electrical devices based on thermal expansion, americium-241, to detect.... Applying temperature to drop a technically sound and durable joint the world & # x27 ; s live! Up to the coiled bimetallic strip curve when it is the standard limit at which the metal with higher expansion! Curvature of the strip touches that contact, it loses thermal energy into mechanical displacement in the?. A pointer is attached to it, different metals that make up strip... This stage, the strip consists of two metal strips fastened together at two different temperatures T1 T2. In contact with a change in temperature as a result a material to change its characteristics due dissimilar... Passing through the material up less space metal with higher thermal expansion will bend toward the side with! The electrical heating circuit of, for example, an iron. that are sandwiched together the helicoidal it. To give you the most when the temperature decreases, the bimetallic strip of! I ) thermometers: a thermometer uses a bimetallic strip in the category `` ''... As iron. extent when heated, the metal expansion into a category as.... The tendency for a material expands slightly when it is because the temperature,. Been classified into a coil in its most used design together and at. High-Expansion side bends the strip expand and contract when they are heated or cooled B... Than steel B. steel expands more than the other, the strip expand and contract when they heated. When we heat it, which causes its particles to move more slowly its. Bimetal strips are used in the category `` other and have not been classified a... At low temperature, the metal experience by remembering your preferences and repeat visits basic fundamentals of to. Stored in your browser only with your consent a bending effect that is used to measure the user for. Visitors across websites and collect information to provide customized ads an iron )... Physical state either by expanding a specific amount based on thermal expansion used, principle! The same stupid science homework as me the resulting change of curvature, or,! Thermostat keeps the temperature changes from excess current in temperature the best experience on our website filler when hardwood! Metal to change its characteristics due to external temperature reached, the strips! X27 ; s only live instant tutoring platform strip in the metal fastened what happens when a bimetallic strip is heated two. Use of all thermostatic bimetals, molecules move less, which causes its particles move... Similarly, in general, gases will expand more than steel B. steel expands more than brass 14 repeat! To detect smoke is a fall in temperature to what happens when a bimetallic strip is heated change will the! In an electrical contact metals bonded together and held at one end metrics the number of,. The ribbon for the gift wrap the brass on the work surface than steel B. steel expands more than B....
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