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This balance is called hydrostatic equilibrium. A star is like a balloon. In a balloon the gas inside the balloon pushes outward and the elastic material supplies just enough inward compression to balance the gas pressure.
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www.astronomynotes.com/starsun/s7.htm
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The sun is also in thermal equilibrium -- the rate of energy production in its core is matched to the rate at which it is losing energy at its surface: ... Diagram of hydrostatic equilibrium ... Drawing of pressure/temperature equilibrium...
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ircamera.as.arizona.edu/NatSci102/text/hydrostat.htm
ircamera.as.arizona.edu/NatSci102/text/hydrostat.htm
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``Hydro'' means pertaining to a fluid, and ``static'' means not moving. ``Equilibrium'' means force balance. So ``hydrostatic equilibrium'' means force balance on the pieces of a fluid such that the fluid does not move in bulk.
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www.ipp.mpg.de/~bds/astro/hydrostatic.html
www.ipp.mpg.de/~bds/astro/hydrostatic.html
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The principle of hydrostatic equilibrium is that the pressure at any point in a fluid at rest (whence, “hydrostatic”) is just due to the weight of the overlying fluid.
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mintaka.sdsu.edu/GF/explain/thermal/hydrostatic.html
mintaka.sdsu.edu/GF/explain/thermal/hydrostatic.html
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What do we mean by hydrostatic equilibrium? ... To what other systems does hydrostatic equilibrium apply? ... Key Principle: Hydrostatic Equilibrium...
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www.nrao.edu/~smyers/courses/astro12/L11.html
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1. The equilibrium which exists on the average between the radiation received by a planet and its atmosphere from the sun and that emitted by the planet and atmosphere. That the equilibrium does exist in the mean is demonstrated by the observed long-term constancy of the earth's surface temperature.
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www.hq.nasa.gov/office/hqlibrary/aerospacedictionary/50...
www.hq.nasa.gov/office/hqlibrary/aerospacedictionary/508/h.html
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CiteSeerX - Document Details (Isaac Councill, Lee Giles): We analyse the effects of thermal conduction in a relativistic fluid, just after its departure from hydrostatic equilibrium, on a time scale of the order of thermal relaxation time. ... Add To MetaCar ... 1 1 Introduction. Most part of the life of stars (at any stage...
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citeseer.ist.psu.edu/437887.html
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We derive the hydrostatic equilibrium equation of a spherical star for any gravitational Lagrangian density of the form . The Palatini variational principle for the Helmholtz Lagrangian in the Einstein gauge is used to obtain the field equations in this gauge.
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www.iop.org/EJ/abstract/0264-9381/24/9/011/
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