- Standard gravity
**Standard gravity**, usually denoted by "g"_{0}or "g"_{n}, is the nominal acceleration due to gravity at the Earth's surface at sea level. By definition it is equal to exactly 9.80665 m/s^{2}(approx. 32.174 ft/s^{2}). [*The notation m/s*] This value was established by the 3rd CGPM (1901, CR 70).^{2}means "meters per second per second", and the notation ft/s^{2}means "feet per second per second".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 (which is not italicized). The "g" (sometimes written "gee") is also used as a unit of acceleration, with the value defined as above; seeg-force .The value of "g"

_{0}defined above is an arbitrarydubious midrange value on Earth, approximately equal to the acceleration of a body in free fall (in the absence of air resistance) at sea level at a geodetic latitude of about 45.5°. It is larger in magnitude than the average sea level acceleration on Earth, which is about 9.797 645 m/s^{2}. Although the actual strength of gravity on Earth varies according to location (seeEarth's gravity ), for weights and measures and many calculation purposes the standard gravity figure is used.The SI unit of acceleration due to gravity (or, indeed, any acceleration), namely metre per square second, can also be written as

newton perkilogram . The value stays the same: "g_{n}" = 9.80665 N/kg. This alternative representation for the same unit may be more intuitive when considering problems involvingpressure due to gravity, orweight . For example, at sea level the gravitational force between the Earth and a mass of 1 kilogram is 9.80665 newtons.**References****ee also***

Earth's gravity

*g-force , a measure of apparent acceleration

*"G", the gravitational constant in Newton's law of gravity

*Gravitational acceleration **External links***http://physics.nist.gov/Document/sp330.pdf#page=39

*http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf#page=51 (pg.51 in pdf)·

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