Question

Predict the sign of ΔSsys for each process: (b) Hot air expands.

Answer 1

The sign of ΔSsys for hot air expands is positive.

Entropy (S) is the degree of randomness or disorderliness in a thermodynamic system. The randomness increases when the motion of molecules increases due to the addition of heat. It also increases when the distance between the molecules increases.

ΔS is a measurement of the change in entropy in a thermodynamic system. It is positive when entropy increases and negative when it decreases.

When the hot air expands the distance between the molecules of the gas increases and thus the randomness also increases. Entropy increases and the of  ΔS becomes positive.

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