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Mass per unit of volume.
Mass per unit of volume. The density of all substances varies with temperature and pressure: as a rule increasing the temperature reduces the density, as does reducing the pressure. Water is unusual: it is most dense at 4°C, and becomes less dense whether temperature increases or decreases from that point.
The density of all substances varies with temperature and pressure: as a rule increasing the temperature reduces the density, as does reducing the pressure. Water is unusual: it is most dense at 4°C, and becomes less dense whether temperature increases or decreases from that point.