In chemistry, the law of definite proportions, sometimes called Proust's Law, states that a chemical compound always contains exactly the same proportion of elements by mass. An equivalent statement is the law of constant composition, which states that all samples of a given chemical compound have the same elemental composition by mass. For example, oxygen makes up about 8/9 of the mass of any sample of pure water, while hydrogen makes up the remaining 1/9 of the mass. Along with the law of multiple proportions, the law of definite proportions forms the basis of stoichiometry.
Read more about Law Of Definite Proportions: History, Non-stoichiometric Compounds
Famous quotes containing the words law of, law, definite and/or proportions:
“The Law of Triviality ... briefly stated, it means that the time spent on any item of the agenda will be in inverse proportion to the sum involved.”
—C. Northcote Parkinson (1909–1993)
“The greatest step forward would be to see that everything factual is already theory. The blueness of the sky reveals the basic law of chromatics. Don’t look for anything behind the phenomena, they themselves are the doctrine.”
—Johann Wolfgang Von Goethe (1749–1832)
“... life cannot be administered by definite rules and regulations; that wisdom to deal with a man’s difficulties comes only through some knowledge of his life and habits as a whole ...”
—Jane Addams (1860–1935)
“An amoeba is a formless thing which takes many shapes. It moves by thrusting out an arm, and flowing into the arm. It multiplies by pulling itself in two, without permanently diminishing the original. So with words. A meaning may develop on the periphery of the body of meanings associated with a word, and shortly this tentacle-meaning has grown to such proportions that it dwarfs all other meanings.”
—Charlton Laird (b. 1901)