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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Likhit Kaushik posted an Question
May 03, 2021 • 21:25 pm
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30 points
30 points
- CSIR NET
- Physical Sciences
When a pertect gas is supposed to expand freely against vacuum in a insulated vessel, the gas has urdergone- (a) an increase in pressure (b) a change in tempera
when a pertect gas is supposed to expand freely against vacuum in a insulated vessel, the gas has urdergone- (a) An increase in pressure (b) A change in temperature (d) A change in phase (c) Achange in entropy
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Monika verma 1![best-answer]()
option (a) is correct 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.
Then why entropy is not changing?
If an ideal gas expands into a vacuum, it does no work. Hence, the internal energy is unchanged and the temperature is unchanged.so, entropy remains unchanged