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1.2.2 The constant of gravitation

Newton’s law of gravitation states that the force between two masses M₁ and M₂ at a distance d is GM₁M₂/d². Its validity, taking account of general relativity, has been confirmed within the experimental uncertainties. The constant G is not known to much better than 1 in 10⁴; Luther and Towler (1982) obtained a final value of:
G = 6.672 59(43) × 10⁻¹¹ m³ kg⁻¹ s⁻²
This value, with an expanded uncertainty, forms the basis of the Cohen and Taylor value given below.

Proof note: there have been further values reported during 1994 which have not yet been evaluated.

Reference

G. G. Luther and W. R. Towler (1982) P.R. Lett., 48, 121–123.

B.W.Petley

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