Adding thermal energy to a cup of water can cause particles of water to move faster.
Substances are made up of particles which are in constant random motion colliding frequently with each other as well as with the walls of the container. This is a postulate of the kinetic theory of matter.
The temperature of a substance is defined as the average kinetic energy of the particles of that substance. As temperature increases, the kinetic energy of the particles increases because the average velocity of the particles of the substance increases.
Therefore, adding thermal energy to a cup of water can cause particles of water to move faster.
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