When the volume of a substance is reduced, its thermal energy does not decrease by the same amount. The thermal energy of a substance is related to its temperature, not its volume.
When the volume of a substance is reduced, its thermal energy does not decrease by the same amount. The thermal energy of a substance is related to its temperature, not its volume. Temperature is a measure of the average kinetic energy of the particles in a substance, and it determines the substance's thermal energy. So, reducing the volume of a substance may affect its temperature, but the change in thermal energy would depend on the specific heat capacity of the substance and the amount of heat transferred.