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Quintessence Means Fifth Element

FOUR ELEMENTS Plato defined four basic elements as earth, water, air, and fire. In his analysis of geometry he defined five regular solids. He paired up the four elements with four of the five regular solids and this suggested to him that there might be another element. He assigned earth to the cube, water to […]

1667 – phlogiston theory

Phlogiston theory was a failure and eventually shown to be false. It was based on the idea that any combustible substance contained an element known as phlogiston that was released during the burning process. This had historical roots in various theories of alchemy which generally included four elements: fire, water, air and earth. The first […]