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Question: Answered & Verified by Expert
In an adiabatic expansion of an ideal gas the product of pressure and volume
PhysicsThermodynamicsKCETKCET 2020
Options:
  • A decreases
  • B increases
  • C remains constant
  • D at first increases and then decreases
Solution:
1990 Upvotes Verified Answer
The correct answer is: decreases
In an adiabatic expansion, internal energy decreases and hence temperature also decreases. Hence, from ideal gas equation,
$p V=n R T$
Since, $T$ decreases.
Hence, $p V$ also decreases.

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