Hydrostatic Equilibrium - The balance maintained between the force of gravity and the vertical pressure gradient that does not allow air to escape to space.
Hygrometer - An instrument designed to measure relative humidity.
gravity wave - (Also called gravitational wave.) A wave disturbance in which buoyancy (or reduced gravity) acts as the restoring force on parcels displaced from hydrostatic equilibrium.
(Or gravitational or buoyant convection.) Motions that are predominantly vertical and driven by buoyancy forces arising from static instability, with locally significant deviations from hydrostatic equilibrium.
Isothermal Atmosphere An atmosphere in hydrostatic equilibrium in which the temperature is constant with altitude and in which, the pressure decreases exponentially upward.
Hydrostatic Equilibrium: The balance between gravity force and vertical force air movement.
Hygrograph: A recording produced by a hygrometer.
Hygrometer: A weather instrument used to measure relative humidity.
 See also: Atmosphere, Pressure, Air, Water, Energy
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