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In an adiabatic expansion of an ideal gas the product of pressure and volume
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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.
$p V=n R T$
Since, $T$ decreases.
Hence, $p V$ also decreases.
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