Certain observations that have long been considered to be gravitational in nature may well be electromagnetic interactions. An example of this is the experimental measurement of the gravitational constant. Based on gravitational logic, the forces produced by a Cavendish balance have been used to measure the gravitational constant (G). This result is then used to determine the mass of the Earth in terms of kilograms. The Cavendish balance measures mass by the amount of long range electric force that it can block.