definition
Mathematical form of equilibrium condition of force system of equilibrium equation. The equilibrium condition of any force system in space is that the principal vector and principal moment of the force system are equal to zero, that is, R=0 and MO=0.
Static equation
Represents the quantitative relationship between air pressure and height when vertical force is balanced. The above formula shows that the pressure difference (dp) between two different heights is equal to the weight per unit cross-sectional area (ρgdz) of the air column between these two heights. The negative sign in the formula indicates that the air pressure decreases with the increase of height.
When dz>0, differential pressure
The law of air pressure changing with height reflected by the static equation is almost universally applicable to all atmospheric movements unless there is a strong vertical movement. Its conclusion has been widely used in meteorology.
Refer to the above? Baidu Encyclopedia-Equilibrium Equation