When a substance is heated, the particles move faster and the amount of kinetic energy increases.
The temperature of a body simply refers to the average kinetic energy of the particles of the body. Given that when a substance is heated, energy is supplied to the substance causing the molecules of particles of the substance to move faster, the average kinetic energy of the molecules of the body increases.
Therefore, since temperature is directly proportional to the velocity and average kinetic energy of the molecules, when a substance is heated, the particles move faster and the amount of kinetic energy increases.
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