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出典:Wikipedia
出典:『Wikipedia』 (2010/10/07 05:54 UTC 版)
Sigma-t is a unit used in oceanography to measure the density of seawater at a given temperature. σT is defined as [ρ(S,T)-1] × 103, where ρ(S,T) is the density of a sample of seawater at temperature T and salinity S, measured in gcm-3, at standard atmospheric pressure.
Sigma-t