British chemist and mathematician (1766–1844)
He gave chemistry its atoms—not as philosophy but as hard numbers. Dalton turned vague ideas about indivisible matter into a quantitative framework: each element made of identical atoms with fixed weight, compounds forming in whole-number ratios. That 1808 model is still how we count the molecular world.
Dalton was an English chemist, physicist, and meteorologist born in early September 1766. For over fifty years he kept daily weather records, and his work on gas behavior led him to formulate the first empirical law of partial pressures. Studying his own vision, he produced the first scientific account of color blindness—a condition still called Daltonism in several languages. Then in 1808 he published A New System of Chemical Philosophy, proposing that elements consist of identical atoms of characteristic weight and that compounds form when those atoms combine in fixed proportions. The book s…
Sourced, dated quotes from John Dalton
1. Small particles called atoms exist and compose all matter; 2. They are indivisible and indestructible; 3.
A pure elastic fluid is one the constituent particles of which are all alike, or in no way distinguishable. Steam, or aqueous vapour, hydrogenous gas, oxygenous gas...
Chemical analysis and synthesis go no farther than to the separation of particles one from another, and to their reunion.
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