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Density
Density is defined as the mass per unit volume of a substance, so it has the units ofkg/m3 in the SI metric system. Notice that it is mass and not weight that is used in this definition. The symbol commonly used for density is the Greek letter p.
As we will see later, the density of air changes with height and with the weather conditions. The density of water is conveniently 1000 kg/m3, and hardly varies at all, even if subjected to a very high pressure.
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Fig 1.8 Force due to pressure acts at right angles to the surface
