Proper water properties calculator: Speed of sound in water
God speed on your way! (C) An archaic expression
0. Brief description. Very basic theory.
In real-world applications, speed of sound in water is a function of water
temperature t, water salinity s and hydrostatic
pressure P. The range of these three parameters in most of Earth's
water bodies varies from -2 to 40°C for temperature, 0..42 PSU for salinity, and
from ~1 to 1100 bar for pressure. So, the speed of sound varies from approximately
1400 m/s in cold freshwater under low pressure to up to 1700 m/s in warm saline
water under high pressure. There is a lot slightly different empiric equations
for estimation of the speed of sound in water, obtained from big datasets of
measurements. One can find it in works, listed
Here we use the equation from the work of Chen and Millero
pp 1129-1135, so-called UNESCO Equation. It uses pressure rather than depth as a parameter.
It is more convenient since the depth itself cannot be measured directly in most cases.
This calculator is made with UCNLPhysics free and open source library.
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(C) Alek Dikarev, 2020
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