For 10 points, Henry Cavendish measured what value, associated with the weakest of the fundamental forces, symbolized by a capital G?
John Mitchell's experimental design, instrumental in this value's determination, appeared in "Philosophical Transactions." This value, in units of meters cubed over kilograms seconds squared, can be multiplied by an object's mass to yield a parameter denoted by the Greek letter mu. In measuring the Earth's [*] density relative to that of water by a torsion balance, it was indirectly calculated 70 years after Newton had proposed its existence as a proportionality constant in an inverse square law expression. For 10 points, Henry Cavendish measured what value, associated with the weakest of the fundamental forces, symbolized by a capital G?
John Mitchell's experimental design, instrumental in this value's determination, appeared in "Philosophical Transactions.
universal {gravitational constant} [prompt on partial answers; accept {big G} ; prompt on {just} “ {G} ”]