What Is a Hydrostatic Balance?

Hydrostatic equilibrium (English: Hydrostatic equilibrium) refers to the balance between the pressure due to the gravity of the earth and the pressure gradient force formed by the pressure gradient in the direction opposite to the former. The balance between these two forces is also called static equilibrium, hydrostatic equilibrium.

Hydrostatic equilibrium

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Hydrostatically balanced fluid

Hydrostatic equilibrium and hydrostatics are closely related to the principle of fluid equilibrium. Hydrostatic balance is a special balance for measuring water in water. Hydrostatic balance can be used to find the specific gravity between them.

Hydrostatically balanced atmosphere

Hydrostatic pressure balance is an important balance to support the non-collapse of the atmosphere.

Hydrostatic equilibrium astronomy

Hydrostatic equilibrium is the reason why stars do not collapse inwardly (implosion) or explode. In astrophysics, any given layer inside a star is in a state of equilibrium between thermal pressure (outward) and the pressure (inward) generated by the mass of the material outside it. This balance is called hydrostatic equilibrium . A star is like a balloon. In the balloon, the gas inside the balloon is squeezed outwards. Atmospheric pressure and elastic materials provide sufficient inward resistance pressure to balance the internal and external pressure of the balloon. In the case of a star, the mass inside the star provides inward pressure, and an isotropic gravity field compresses the star to make it the most compact shape: spherical.

Note, however, that a star can only be an ideal sphere, for reasons related only to its own gravity. In reality, all other forces change out-of-image, the most commonly noticed is the centrifugal force generated by the rotation of the star. A spinning star will become an ellipsoid under hydrostatic equilibrium according to its angular velocity; at this point, it will become a Jacobian (irregular) ellipse, and a higher rotation speed will form a pear shape [1]. An extreme example is the weaver star, whose rotation period is 12.5 hours, so its equator is about 20% fatter than the poles.

If a star has a large companion star nearby, it will produce tidal forces, which will distort its sphere into a flat sphere in the direction of the companion star. An example of Gradation II (Lynoma ).

It is also important in galaxy cluster media, which limits the total amount of gas that can exist in the core of a galaxy cluster.

In addition, having sufficient mass to overcome rigid body forces with its own gravity to present a hydrostatically balanced shape is also the definition of a planet or dwarf in the solar system. ^[2]