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Is water resistance due to density or pressure?

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You mean 'what is the volume of I mole of water?' 22.4 litres applies only to gases. You use the density for liquids so 1 mole, 18g, occupies 18 ml. read more

The density of water versus temperature and pressure is indicated below: See also Water - Density, Specific Weight and Thermal Expantion Coefficient, for online calculator, figures and tables showing changes with temperature. read more

SG = Specific gravity of liquid (e.g. fresh water = 1) Height of Liquid Column. Enter the measured liquid depth to, or the height of fluid from a point at which the hydrostatic pressure is to be calculated. Specific Gravity (SG) Enter here the ratio of liquid density compared to the density of fresh water (1000 kg/m 3). read more

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