New Measurements of G Using the Measurement Standards Laboratory Torsion Balance

Details New Measurements of G Using the Measurement Standards Laboratory Torsion Balance New Measurements of G Using the Measurement Standards Laboratory Torsion Balance

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvl..91t1101a&link_type=abstract

Physical Review Letters, vol. 91, Issue 20, id. 201101

Physics

21

Experimental Tests Of Gravitational Theories, Determination Of Fundamental Constants

Scientific paper

This Letter presents the results of a series of measurements of the Newtonian gravitational constant G using the compensated torsion balance developed at the Measurement Standards Laboratory. Since our last published result using the torsion balance in the compensated mode of operation [Meas. Sci. Technol.101999439], several improvements have been made to reduce the uncertainty in the final result. The new measurements have used both stainless steel and copper large masses. The values of G for the two sets of masses are in good agreement. After combining all of the measurements we get a value of G=6.673 87(0.000 27)×10-11 m3 kg-1 s-2. This new value is 5parts in 105 smaller than our previous published values.

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