The crossword solution for the term 'becomes agitated' is 'boils'. Boiling is a physical change that occurs when a liquid is heated to its boiling point, which is the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure. When a liquid boils, it produces bubbles of vapor that rise to the surface and form a foam. Boiling is an example of an exothermic reaction, meaning that it releases energy in the form of heat.