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Too many things to quickly create a comprehensive list, most notably mean sea level establishes a known datum for measuring altitude and depth. Environmental variables that establish a gradient roughly perpendicular to this datum can the also be measured "with respect to sea level". For example temperature gradients in the ground and in the air, also pressure gradient in the atmosphere. In chemistry it is common to refer to Standard Temperature and Pressure (STP), particles are assumed to be moving at a certain rate established at a specific temperature and a specific pressure that is the mean pressure at sea level.

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10y ago

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