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When an ideal gas expands in vaccum, the...

When an ideal gas expands in vaccum, there is neither absorption nor evolution of heat. Why?

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In an ideal gas, there are no intermolecular forces of attraction. Hence, no energy is required to overcome these forces,. Moreover, when a gas expands against vacuum,work done is zero( because`P_(ext) =0)`. Hence, internal energy of the system does not change,i.e., there is no absorption or evolution of heat.
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