When does entropy increase?

Answer 1

Entropy increases when a system increases its disorder.

Basically, a solid is pretty ordered, especially if it is crystalline. Melt it, you get more disorder because molecules can now slide past one another. Dissolve it, and you get another entropy increase, because the solute molecules are now dispersed among solvent.

Order of entropy from least to greatest:
Solid--> Liquid --> Gas

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Answer 2

Caleb Adams

Entropy increases in a closed system when the system undergoes irreversible processes, such as diffusion, mixing of substances, or energy dispersal.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.