The nature of gravitation and G is not well understood. A new gravitation\nmechanism is proposed that explains the origin and essence of the gravitational\nconstant, G. Based on general relativity, the vacuum is considered to be\na superfluid with measurable density. Rotating bodies drag vacuum and create\na vortex with gradient pressure. The drag force of vacuum fluid flow in\nthe arm of the vortex is calculated relative to the static vacuum and a value\nthat is numerically equal to that of G is obtained. Using Archimedesâ?? principle,\nit is determined that G is the volume of vacuum displaced by a force\nequivalent to its weight which is equal to the drag force of the vacuum. It is\nconcluded that the gravitational constant G expresses the force needed to displace\na cubic metre of vacuum that weighs one kg in one second. Therefore,\nG is not a fundamental physical constant but rather is an expression of the resistance\nencountered by the gravitational force in the vacuum.
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