What happens to a class of water as the average molecular kinetic energy of the water molecules increase

As the average kinetic energy of the glass of water increases, the temperature of the water increases. Temperature is a measure of the rate at which an atom or molecule oscillates, and if enough energy is given to this molecule, it can break free from the rest through a phase change to become a gaseous water molecule.

Most smaller stars don't have a radiative zone.

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