Entropy and Temperature Variation

This article discusses the variations of entropy with temperature and volume.

What is entropy?

Entropy is a measure of the disorder of a system.

How does entropy change with temperature?

Entropy increases with temperature, because a higher temperature allows for more molecular motion, which results in more disorder.

How does entropy change with volume?

Entropy decreases with volume, because a smaller volume restricts molecular motion, which results in less disorder.

What is the entropy change for an isothermal expansion of an ideal gas?

The entropy change for an isothermal expansion of an ideal gas is given by nR ln(V2/V1), where n is the number of moles of gas, R is the gas constant, and V1 and V2 are the initial and final volumes of the gas.