An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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hydrostatic equation
  هموگش ِ هیدر-ایستاییک  
hamugeš-e hidristâik
Fr.: équation hydrostatique  

The equation describing the → hydrostatic equilibrium in a star, expressed as: dP/dr = -GMρ/r2, where
P and M are the mass and pressure of a spherical shell with thickness dr at some distance r around the center of the star, ρ is the density of the gas, and G the → gravitational constant.

See also: → hydrostatic; → equation.