John Dalton (1766- 1844) was a British chemist born from noble family. Dalton was the first man that gives explanation scientificly about color- blind(1794), a condition which he suffers and known as “Daltonism”. Dalton noted more than 200,000 atmosphere research and researched gas mixture and gas expansion when they were heated. Dalton’s law is still used to describe then law of partial presure in chemistry. This work brougth him to his reatest contribution in chemistry, that is an atomic theory of matter which has scientific base. He started teaching his discovery in 1803 and published his discoveries in A New System of Chemical Philosophy in 1808.
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