# Geopotential height

From AMS Glossary

## geopotential height

The height of a given point in the atmosphere in units proportional to the potential energy of unit mass (geopotential) at this height relative to sea level.

The relation, in SI units, between the geopotential height where

*Z*and the geometric height*z*is*g*is the acceleration of gravity and*g*_{0}is the globally averaged acceleration of gravity at sea level (*g*_{0}= 9.806 65 m s^{−2}), so that the two heights are numerically interchangeable for most meteorological purposes. Also, one geopotential meter is equal to 0.98 dynamic meter.*See*dynamic height.*Term edited 14 November 2017.*