Balance between pressure forces and gravitational forces in a star's layers.
the condition in which pressure and gravitational forces in a star or planet are in balance. Without such balance, bodies will either collapse or expand.
The balance between weight of the material pressing downward on a layer in a star and the pressure in that layer. Infrared Cirrus A fine network of filaments covering the sky detected in the far infrared by the IRAS satellite; believed associated with dust in the interstellar medium.
a balance between the compression from the weight of material above a layer and the expansion of an outward-directed pressure below the layer. In normal stars and planet atmospheres, the outward-directed pressure is supplied by the thermal pressure of warm or hot gases.
The state of the atmosphere when there is a balance between the vertical pressure gradient force and the downward pull of gravity.
The state of a fluid with surfaces of constant pressure and constant mass (or density) coincident and horizontal throughout. Complete balance exists between the force of gravity and the pressure force. The relation between the pressure and the geometric height is given by the hydrostatic equation. The analysis of atmospheric stability has been developed most completely for an atmosphere in hydrostatic equilibrium. See parcel method, slice method, quasi-hydrostatic approximation.
A balance between the weights of various layers, as in a star or the Earth's atmosphere, and the pressures that support them.
Hydrostatic equilibrium is a stable condition in a star in which the fluid matter within the star is at an equilibrium with respect to all forces, including the inward-pulling force of gravity, the out-ward pulling buoyancy due to pressure differentials, and the out-ward pulling forces of radiative pressure.
Hydrostatic equilibrium occurs when compression due to gravity is balanced by a pressure gradient which creates a pressure gradient force in the opposite direction. The balance of these two forces is known as the hydrostatic balance.
