When geostrophic flow is achieved, the Coriolis force is balanced by the gravitational force.
Theoretically, if the Coriolis force and the pressure gradient force were exactly balanced, geostrophic flow would follow. The term "geostrophic equilibrium" or "geostrophic balance" refers to this situation (also known as geostrophic). Parallel to isobars is the direction of the geostrophic wind (lines of constant pressure at a given height).
In nature, this balance rarely occurs exactly. Due to other forces like ground friction, the genuine wind almost always differs from the geostrophic flow. As a result, only in the absence of friction (such as above the atmospheric boundary layer) and with perfectly straight isobars would the actual wind match the geostrophic wind.
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