Hydrostatic equilibrium | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Hydrostatic_equilibrium


00:01:13 1 Mathematical consideration
00:01:24 1.1 Derivation from force summation
00:08:35 1.2 Derivation from Navier–Stokes equations
00:08:58 1.3 Derivation from general relativity
00:10:05 2 Applications
00:19:06 2.1 Fluids
00:19:16 2.2 Astrophysics
00:19:43 2.3 Planetary geology
00:32:00 2.4 Atmospherics
00:35:18 3 See also
00:35:47 4 Notes



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SUMMARY
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In fluid 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 Earth's atmosphere into a thin, dense shell, whereas gravity prevents the pressure gradient force from diffusing the atmosphere into space.
Hydrostatic equilibrium is the current distinguishing criterion between dwarf planets and small Solar System bodies, and has other roles in astrophysics and planetary geology. This qualification typically means that the object is symmetrically rounded into a spheroid or ellipsoid shape, where any irregular surface features are due to a relatively thin solid crust. There are 32 observationally confirmed such objects (apart from the Sun), sometimes called planemos, in the Solar System, seven more that are virtually certain, and a hundred or so more that are likely.