Article | REF: K170 V1

Physical properties of seawater

Author: Gérard COPIN-MONTÉGUT

Publication date: November 10, 2002, Review date: March 18, 2024

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2. Basic hydrological data

In the current state of oceanographic technology, the three physical quantities that are easiest to measure, particularly with in situ probes, are pressure, temperature and electrical conductivity.

2.1 Pressure

The unit of pressure in the international system is the pascal (Pa), which corresponds to a force of 1 newton.m –2 . In oceanography, we always use the bar, or its sub-multiple the decibar (atmospheric pressure is roughly 1 bar, while the hydrostatic pressure of a 1 m column of water is roughly 1 decibar).

1 bar = 10 5 Pa and 1 dbar = 10 4 Pa

Before using the calculation...

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