When an ideal gasexpands into vaccum, there is neither absorption nor

1.	When an ideal gasexpands into vaccum, there is neither absorption nor evolution of heat. Why?
Answer» SOLUTION :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 doneis 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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