Sigma-t
Encyclopedia
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.
Oceanography
Oceanography , also called oceanology or marine science, is the branch of Earth science that studies the ocean...
to measure the density
Density
The mass density or density of a material is defined as its mass per unit volume. The symbol most often used for density is ρ . In some cases , density is also defined as its weight per unit volume; although, this quantity is more properly called specific weight...
of seawater
Seawater
Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% . This means that every kilogram of seawater has approximately of dissolved salts . The average density of seawater at the ocean surface is 1.025 g/ml...
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.