静水压平衡 （英文：Hydrostatic equilibrium）是指当由于地球重力产生的压力和由压力梯度形成的与前者方向相反压强梯度力之间的平衡。这两种力之间的平衡也称为静力学平衡、流体静力平衡。
无扰动的流体静力平衡状态下的地球重力场是平行重力场。
Undisturbed earths gravity field under the status of hydrostatic equilibrium is parallel gravity field, and its distribution of mass density is spherically Symmetric.
值得强调指出，在恒星大气中，流体静力平衡是非常精确地成立的。
A point worth emphasizing is that hydrostatic equilibrium is fulfilled with great accuracy in stellar atmosphere.
地球大气就处于地球引力和大气中气体压力共同作用之下的流体静力平衡状态。
The earth's atmosphere is in hydrostatic equilibrium under the combined action of the gravitational attractive force of the earth and the pressure of the gases in the atmosphere.
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