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单词 gravitational constant
释义
gravitational constant
Physics

  • Symbol G. The constant that appears in Newton’s law of gravitation; it has the value 6.672 59(85)×10−11 N m2 kg−2. G is usually regarded as a universal constant although, in some models of the universe, it is proposed that it decreases with time as the universe expands.

Mathematics

  • The constant of proportionality, denoted by G, that occurs in the inverse square law of gravitation. Its value is dependent on the assumption that the gravitational mass and the inertial mass of a particle to have the same value. The dimensions of G are L3 M−1 T−2, and its value is 6.672×10−11Nm2 kg−2.

Astronomy

  • The constant that appears in Newton’s law of gravitation. It is the attraction between two bodies of unit mass at unit distance apart. Its value is 6.674 08 × 10−11 N m2/kg2 when the distance is expressed in metres and the masses are in kilograms. Although it is described as a constant, in some models of the Universe G decreases with time as the Universe expands (see Brans–Dicke theory), but there is no evidence for this.

Geology and Earth Sciences

  • The constant of proportionality relating the gravitational force (F) between two masses (m1 and m2) separated by a distance r. F = Gm1m2/r2. The value of G is 6.672 × 1011 Nm2/kg2.
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