Question

When a perfect gas expands freely against the vacuum in an insulated vessel, the gas has undergone ?
Change in temperature
Change in phase
Change in entropy
An increase in pressure​

Answer 1

Answer:

When an ideal gas expands into the vacuum it does zero work. Since the gas does not have to expend any internal energy for the expansion, the term free expansion. Since there is no change in internal energy, the temperature of the ideal gas does not change on free expansion.

Explanation:

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