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fluid theory of electricity
The fluid theory of electricity〔Theory of electricity and magnetism. By Charles Emerson Curry. (p47 )〕 (and "''Two-fluid''" theory〔The Mathematical Theory of Electricity and Magnetism. By Sir James Hopwood Jeans.〕) is an outdated theory that postulated an electrical fluid which was responsible for many electrical phenomena in the history of electromagnetism. The "two-fluid" theory, created by Charles François de Cisternay du Fay, postulated that electricity was the interaction between two electrical 'fluids.' An alternate simpler theory was proposed by Benjamin Franklin, called the unitary, or one-fluid, theory of electricity. This theory claimed that electricity was really one fluid, which could be present in excess, or absent from a body, thus explaining its electrical charge. Franklin’s theory explained how charges could be dispelled (such as those in Leyden jars) and how they could be passed through a chain of people. The fluid theory of electricity eventually became updated to include the effects of magnetism, and electrons (upon their discovery).
==Fluid Theories==
In the 1700s many physical phenomenons where thought of in terms of an Aether, which was a fluid that could permeate matter. This idea had been used for centuries, and was the basis of thinking about physical phenomenons, such as electricity, as liquids.
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