bimetallic bar made of copper and iron bends toward the iron when heated because?
A bimetallic strip is made of two kinds of metal bonded together. Both kinds of metal have a different coefficient of expansion. So when the bar heats up, the side with the larger coefficient expands more, so the bar bends towards the other side. When the bar cools down it bends the other way. In this case, copper expands more than iron, so the bar will bend towards the iron side when it gets hot, and towards the copper side when it gets cold.
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The two metals have an additional Linear Coefficient of Thermal progress, so once they expertise a change in temperature, one will develop greater than the reverse. Readily do the scan -- everything can be clear.
