# Does expansion of an ideal gas not always represent an increase in entropy of the system?

Expansion of an ideal gas not always represent an increase in entropy of the system. Statement is True or False?

What I thought is that whenever an ideal gas expands the randomness of gas molecules increases. So, entropy must increase.

• What if, during the expansion, the temperature decreases? – Chet Miller May 7 '18 at 16:40