Density
The mass of a substance in unit volume is density (D).
D = m / V
Measuring the density of substances is easier when compared to the density of other substances in the density of information. Water is used for this purpose. The ratio of the density of the substance in water is called specific gravity (SG) of the substance.
SG = Dsubstance / dwater
The density of water is 1000 kg/m3
Pressure
The pressure (P) is the force (F) per unit area (A)
P = F / A
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