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- W2964277216 abstract "G measurements are made with torsion balance in “vacuum” to the aim of eliminating the air convection disturbances. Nevertheless, the accuracy of the measured values appears unsatisfying. In 2000 J. Luo and Z. K. Hu first denounced the presence of some unknown systematic error in high vacuum G measurements. In this work a new systematic effect is analyzed which arises in calm air from the non-zero balance of the overall momentum discharged by the air molecules on the test mass. This effect is negligible at vacuum pressures higher than a millibar. However in the interval between the millibar and the nanobar the disturbing force is not negligible and becomes comparable to the gravitational force when the chamber pressure drops to about 10 5 bar. At the epoch of Heyl’s benchmark measurement at 1–2 millibar (1927), the technology of high vacuum pumps was developed, but this chance was not utilized without declaring the reason. The recent G measurements use high vacuum techniques up to 10 10 and 10 11 bar, but the effect of the air meatus is not always negligible. We wonder whether the measurements in the interval between the millibar and the nanobar have been made. As a matter of fact, we were not able to find the related papers in the literature. A physical explanation of the denounced unknown systematic error appears useful also in this respect." @default.
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- W2964277216 date "2009-07-01" @default.
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- W2964277216 title "The Missing Measurements of the Gravitational Constant" @default.
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