Principle (chemistry)

Principle (chemistry)

In modern chemistry, principles are the constituents of a substance, specifically those that produce a certain quality or effect in the substance, such as a "bitter principle", which is any one of the numerous compounds having a bitter taste.

In pre-modern chemistry and alchemy, principles were the five fundamental substances believed to constitute all bodies. Three of these were called "active" or "hypostatical" principles: salt; sulfur, or oil; and spirit, or mercury. The salt was supposed to be the foundation of all savors; the sulfur, of odors; and the spirit, or mercury, of colors. The two "passive" or "elementary" principles were phlegm (or water), and earth (or "caput mortuum").


*"Principle". "Oxford English Dictionary". Oxford University Press. 2nd ed. 1989.
*"Webster's Revised Unabridged Dictionary". 1913.

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