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Atmospheric pressure explained. Computer artwork of a number of small balls in a glass jar, representing the molecules present in a sample of liquid or gas. The molecules at the bottom (red) are squashed more than those above them. This is due to the weight of the molecules pressing down on them. Therefore the lower down the molecules are, the more molecules are above them and the greater the pressure exerted on them. This shows why the atmospheric pressure at sea level is greater than at the top of a mountain, for example.
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