The Unit of Standard Gravity
Standard gravity is equal to 9.80665 meters per second squared. Standard gravity is denoted by g or g0.
The standard gravity is used to estimate the acceleration of a free falling object near the surface of the earth.
This unit of measurement for gravity was defined by the General Conference on Weights and Measures in the year 1901.
The precise value of gravity varies with one's location on the Earth. Hence the convenient use of single value, for more standardized estimations.
A test subject in the Reduced Gravity Walking Simulator at the Langley Research Center in Hampton, Virgina, United States, 1963.