Question

metals on cooling usually
a. contact b. expand
c. both a and b d. none of these​

Answer 1

Explanation:

Correct Question:-

Metals on cooling usually

a. contract

b. expand

c. both a and b

d. none of these

ANSWER:-

Metals generally contract on cooling.

But Why?

• We know that kinetic energy of atoms rapidly move with increasing heat
• And same, they decrease with decreasing temperature
• Hence metals also expand on heating
• They also contract on cooling
• That is why we put a bottle with a metal cap on a hot water when we are unable to open it
• It increases the metal and hence we are able to open it
• The metal wires sag in summers due to extensive heating.