Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Enthalpy changes also occur when a solute undergoes the physical process of dissolving into a solvent. Hot packs and cold packs (see Figure below ) use this property. Many hot packs use calcium chloride, which releases heat when it dissolves according to the equation below. Answer: enthalpy
A:
When a solute dissolves into a solvent what is that called?