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Sigma-t is a quantity used in oceanography to measure the density of seawater at a given temperature. σT is defined as ρ-1000 kg m, where ρ is the density of a sample of seawater at temperature T and salinity S, measured in kg m, at standard atmospheric pressure. For example, a water sample with a density of 1.027 g/cm has a σT value of 27.
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