#What_is_hydrostatic_equilibrium? In fluid mechanics, hydrost | Ethiopian Space Science Society Hawassa Branch

#What_is_hydrostatic_equilibrium?

In fluid mechanics, hydrostatic equilibrium or hydrostatic balance (also known as hydrostasy)is the condition of a fluid or plastic solid at rest. 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 distinguishing criterion between dwarf planets and small Solar System bodies, and has other roles in astrophysics and planetary geology. This qualification means that the object is symmetrically rounded into an ellipsoid shape, where any irregular surface features are due to a relatively thin solid crust. In addition to the Sun, there are a dozen or so equilibrium objects confirmed to exist in the Solar System, with others possible.
To put it simply, hydrostatic equilibrium is the balance struck between pressure-gradient force and gravity. This phenomenon is why Earth's atmosphere neither dissipates into space nor collapses into a thin, dense shell, and is also what gives large celestial objects their ellipsoidal shape.

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