Knowra Hydrostatic equilibrium Hydrostatic equilibrium Hydrostatic equilibrium is a state in which pressure gradients balance gravitational forces in a fluid at rest. It governs pressure variation with depth and helps support stars, planets, and other fluid bodies.
Hydrostatic equation : The differential relation between pressure and height in a fluid at rest under gravity. It expresses the balance as pressure increasing downward in proportion to density and gravitational acceleration.
Stellar structure : The physical organization and internal properties of stars, determined by gravity, pressure, energy transport, and nuclear reactions. Stars remain structurally supported when internal pressure balances inward gravity.
Fluid statics : The study of fluids at rest and the forces and pressure distributions within them. Hydrostatic equilibrium is its central force-balance condition.
Hydrostatic instability : A failure of static force balance that causes a fluid or structure to move or change shape. It marks conditions in which pressure no longer supports the fluid against gravity.
Pressure gradient : The rate and direction in which pressure changes across space. Its upward force per unit volume balances gravity in hydrostatic equilibrium.
Earth's atmosphere : The layer of gases surrounding Earth, held by gravity and shaped by temperature, circulation, and composition. Its pressure generally decreases with altitude because the air above supports the air below.
Gravitational acceleration : The acceleration imparted to matter by a gravitational field at a given location. It sets the strength of the downward force that pressure gradients must oppose.
Convection : Heat transfer through the bulk motion of a fluid. Convection introduces fluid motion, unlike the static state assumed by hydrostatic equilibrium.
Buoyancy : The net upward force exerted by a fluid on an immersed object, caused by pressure differences. The same pressure variation that supports a fluid produces buoyancy on objects within it.
Planetary interior : The layered internal structure of a planet, including its crust, mantle, and core where present. Pressure increases inward as overlying material is supported against planetary gravity.
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