Question

Explain Expansion and contraction of metal due to the sun.
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Answer 1

Answer:

"Expansion and contraction of aetal on heating and cooling are physical changes because the expansion and contraction does not causes any chemical changes in a metal and also contraction and expansion does not produces any other element with different chemical properties."

Answer 2

Answer:

Heat causes metals to expand; cooling causes them to contract. ... Therefore, uneven heating causes uneven expansion, and uneven cooling causes uneven contraction. Under such conditions, stresses are set up within the metal