# Gravitational Constant

The gravitational constant denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies. It usually appears in Sir Isaac Newton's law of universal gravitation, and in Albert Einstein's theory of general relativity. It is also known as the universal gravitational constant, Newton's constant, and colloquially as Big G. It should not be confused with "little g" (g), which is the local gravitational field (equivalent to the free-fall acceleration), especially that at the Earth's surface.

### Other articles related to "constants, gravitational constant, gravitational, constant":

Table of Astronomical Constants
... Defining constants Gaussian gravitational constant k 0.017 202 098 95 A3/2 S−1/2 D−1 defined Speed of light c 299 792 458 m s−1 defined Mean ratio of the TT second to the TCG second 1 − LG ... The values here are appropriate for the older theories, but additional constants are required for current models ... The definitions of these derived constants have been taken from the references cited, but the values have been recalculated to take account of the more precise values of the primary constants cited in ...
Gravitational Constant - The GM Product
... The quantity GM—the product of the gravitational constant and the mass of a given astronomical body such as the Sun or the Earth—is known as the standard gravitational parameter and is denoted ... Depending on the body concerned, it may also be called the geocentric or heliocentric gravitational constant, among other names ... In this case we use the Gaussian gravitational constant k, where and is the astronomical unit is the mean solar day is the solar mass ...
Solar Mass
... Sun (an astronomical unit or AU), and the gravitational constant (G), the mass of the Sun is given by ... The value of the gravitational constant was derived from 1798 measurements by Henry Cavendish using a torsion balance ... mass came into use before the AU and the gravitational constant were precisely measured ...
Cavendish Experiment - Did Cavendish Determine G?
... The formulation of Newtonian gravity in terms of a gravitational constant did not become standard until long after Cavendish's time ... argued that Cavendish did not measure the gravitational constant ... however, often use units where the gravitational constant takes a different form ...
Customary Units Of Measure - Natural Units
... Natural units are physical units of measurement defined in terms of universal physical constants in such a manner that some chosen physical constants take on the numerical ... the base physical units are chosen so that the speed of light and the gravitational constant are set equal to unity ... units are a form of geometric units obtained by also setting Boltzmann's constant, the Coulomb force constant and the reduced Planck constant to unity ...

### Famous quotes containing the word constant:

The tears of the world are a constant quality. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.
Samuel Beckett (1906–1989)