ICM Logo Matthias Tomczak

Enter your values: red boxes are mandatory
T (ºC), temperature: *

S, salinity: *

P (10 kPa, db), pressure: *

 σt(T, S, 0) = kg m-3

σstp(T, S, P) = kg m-3

Add 1000 to the result
to obtain density in kg m-3.

This calculator solves the Equation of State of Seawater
ρ (T, S, P)

Here σ is defined as:

σ (T, S, P) = ρ (T, S, P) - 1000, kg/m3

σt is the density for a given temperature T, salinity S and a pressure P of 0 db.
σstp is the density for a given temperature in-situ a partir de la temperatura, T, salinity S and pressure P.

Note:10 kPa = 1 dbar is close to the pressure increase corresponding to a depth increase of 1 m. If you enter a pressure value equal to the depth in metres it will give an approximate result.

Temperature uses IPTS-68, salinity uses PSS-78; see reference.

Calculation based on Fofonoff, P. and R. C. Millard Jr (1983) Algorithms for computation of fundamental properties of seawater.Unesco Technical Papers in Marine Sciences 44, 53 pp.