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Mechanical Properties of Fluids
Question
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A bimetallic strip is made of two materials A and B whose coefficients of linear expansions are αA and αB respectively (αA > αB). If length of both the rods is same at 0°C, then what will be the shape of bistrip at –10°C and +10°C?

Answer

The coefficient of linear expansion, αA > αB. 
Therefore, for the same change in temperature, A will expand or contract more than B.

So, when the bi-strip is heated i.e. temperature is 10°C, bi-strip will bend with A on convex side and B on concave side.
And when the bi-strip is cooled i.e. temperature is –10°C,  length A decreases more than B. Therefore, A is on concave side and B is on convex side.

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