The expansion of an ideal gas into a vacuum is expected to be spontaneous at high temperature only.

Name: The expansion of an ideal gas into a vacuum is expected to be spontaneous at high temperature only.
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The expansion of an ideal gas into a vacuum (a process known as free expansion) is spontaneous at any temperature, not just at high temperatures, because it is driven by an increase in entropy.

The Expansion of an Ideal Gas into a Vacuum Is