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This guide provides current information and equations for calculating the speed of sound in pure water as a function of temperature and pressure.

Bilaniuk and Wong's equations | |

Del Grosso and Mader's (1972) data re-calculated following adoption of the International Temperature Scale of 1990 | |

Marczak's equation | |

A fifth order polynomial derived from the combined data of Del Grosso and Mader (1972), Kroebel and Mahrt (1976) and Fujii and Masui (1993) | |

Lubbers and Graaff's simplified equation | |

A simple equation valid for a limited temperature range |

Differences between the Bilaniuk and Wong
148 point equation and Marczak's equation
are of the order of 0.02 ms^{-1} or better at most temperatures,
and either equation is suitable for the most accurate work. The Marczak
equation has the advantage that all coefficients are expressed to 6
decimal places rather than the 8 decimal places of Bilaniuk and
Wong.

The equation of Belogol'skii, Sekoyan et al | |

The pressure dependence of sound speed in distilled water |

- Equations of state of water: some guidance.
- Lakes: pure water or sea water?
- Dispersion
- References
- Speed of sound in sea water

For further information, contact Stephen Robinson

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