Hydrostatic equilibrium
From Free net encyclopedia
Hydrostatic equilibrium occurs when compression due to gravity is balanced by outward pressure.
Contents |
Applications
Fluids
The Hydrostatic equilibrium pertains to hydrostatics and the principles of equilibrium of fluids. A hydrostatic balance is a particular balance for weighing substances in water. Hydrostatic balance allows the discovery of their specific gravities.
Physics
In astrophysics, in any given layer of a star, there is a balance between the thermal pressure (outward) and the weight of the material above pressing downward (inward). 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. In the case of a star, the star's internal gravity supplies the inward compression. The isotropic gravitational field compresses the star into the most compact shape possible: a sphere.
In physics, Hydrostatic equilibrium also explains why Earth's atmosphere does not collapse to a very thin layer on the ground and how the tyres on a car or bicycle are able to support the weight of the vehicle.
See also
Reference
Strobel, Nick. (May, 2001). Nick Strobel's Astronomy Notes.fr:Hydrostatique