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sigma-t
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sigma-t

unit of measurement
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Quick Summary

Sigma-t (σt) is a unit used in oceanography to express the density of seawater. It is derived by subtracting 1.0 from the seawater's density and multiplying the result by 1,000. This value is primarily influenced by salinity and temperature, not pressure. The σt value increases as salinity rises or temperature falls. This measurement helps oceanographers accurately record density data, which is crucial for understanding oceanographic processes.1

The term "sigma" also exists as internet slang, referring to a cool, independent, and successful man, or as a general term for something excellent. It can also be used humorously or as a nonsense word.2

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
2 Britannica Sources
  1. sigma
  2. seawater - Density of seawater and pressure

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