Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Standard gravity, usually denoted by g0 or gn, is the nominal acceleration due to gravity at the Earth's surface at sea level, defined to be precisely 9.80665 m/s2. This value was established by the 3rd CGPM. The symbol g is sometimes also used for standard gravity, but g strictly means the local acceleration due to gravity, which varies depending on one's position on Earth. The symbol g should not be confused with G, the gravitational constant, or g, the abbreviation for gram. The g is also used as a unit of acceleration, with the value defined as above; see g-force.
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