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Revision as of 21:00, 21 November 2002
The Greek classical elements are fire, air, water, and earth. They represent in Greek philosophy, science, and medicine the possible constituent building blocks of the cosmos.
Plato mentions them as of Pre-Socratic origin, a list created by the philosopher Empedocles.
- Fire is both hot and dry.
- Air is both hot and wet.
- Water is both cold and wet.
- Earth is both cold and dry.
One classic diagram is to place a two squares on top of each other with the corners of one being the classical elements, and the corners of the other being the properties.
These elements were used by Hippocrates in describing the human body with an association with the four humours: phlegm, yellow bile, black bile, and blood.
Some cosmologies include a fifth element, aether, and some Chinese cosmologies include metal and wood but exclude air.
The Chinese elements correspond to the brighter planets visible with unaided eyes in the night sky: Metal (Venus), Wood (Jupiter), Water (Mercury), Fire (Mars), Earth (Saturn). Air, from the Greek system, was not part of the Chinese system. The Moon represents Yin, the Sun represents Yang. Yin and Yang and the five elements are recurring themes in the I Ching, which is strongly related to Chinese cosmology and astrology.
Some South Asian traditions also include the air, earth, fire, water distinctions.
See also