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Compressibility
It describes how much a substance can decrease in volume when external pressure is applied.
Density
It explains how much matter is packed into a certain volume.
Diffusion
The process in which particles spread from regions of high concentration to regions of low concentration.
Latent heat
Latent heat is the energy absorbed or released without a change in temperature while a substance changes state.
Latent heat of fusion
Energy required to change 1 kg (or 1 mole) of a substance from solid to liquid at constant temperature.
Latent heat of vaporisation
Energy required to change 1 kg (or 1 mole) of a substance from liquid to gas at constant temperature.