In continuum mechanics, a fluid is said to be in hydrostatic equilibrium or hydrostatic balance when it is at rest, or when the flow velocity at each point is constant over time. This occurs when external forces such as gravity are balanced by a pressure gradient force. For instance, the pressure gradient force prevents gravity from collapsing the...
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http://en.wikipedia.org/wiki/Hydrostatic_equilibrium
(from the article `Cosmos`) The same general principles that determine the structure of the Sun apply more broadly to all normal stars: (1) Hydrostatic equilibrium—for a star to ...
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http://www.britannica.com/eb/a-z/h/89
The balance in a star between its gravitational force, which is directed inwards, and the outward forces of gas pressure and, especially in the case of very hot stars, radiation pressure. Because, for most of a star's life, these forces balance, the star neither collapses in upon itself nor blows ap...
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http://www.daviddarling.info/encyclopedia/H/hydrostatic_equilibrium.html
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