Newton's gravitational constant with uncertainty less than 100 ppm

We have obtained a value for Newton's gravitational constant (coverage factor of 1) of G=6.6656(6)/spl times/10/sup -11/ m/sup 3/ kg/sup -1//spl middot/s/sup -2/ with a combined standard uncertainty of 95 ppm. The method is based on a torsion balance which is servocontrolled to constant angular position with an electrostatically induced torque balancing the gravitationally induced torque. This electrostatically induced torque is calibrated using an acceleration method.<
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