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Earth's gravity, denoted by g, refers to the gravitational attraction that the Earth exerts on objects on or near its surface. Its strength is usually quoted in terms of the acceleration it gives to falling bodies (acceleration due to gravity), which in SI units is measured in m/s² (metres per second per second, equivalently written as m·s-2 or N/kg). It has an approximate value of 9.8 m/s², which means that, ignoring air resistance, the speed of an object falling freely near the Earth's surface increases by about 9.8 metres per second every second. There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth. See also Apparent weight. The precise strength of the Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as standard gravity is, by definition, 9.80665 m/s² (32.1740 ft/s²). This quantity is denoted variously as gn, ge (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s²), g0, gee, or simply g (which is also used for the variable local value). The symbol g should not be confused with G, the gravitational constant, or g, the abbreviation for gram (which is not italicized). From the law of universal gravitation, the force on a body acted upon by Earth's gravity is given by
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