John dalton (1September 6th, 766-1July 27th, 844) was a British chemist and physicist. A supporter of atomic theory. The key theory he provided has made great progress in the field of chemistry since then.

Dalton suffers from color blindness, and the symptoms of this disease aroused his curiosity. He began to study this subject and finally published his first paper on color blindness. Later generations called color blindness Dalton's disease in memory of him. 1On July 27th, 844, Dalton passed away.

Dalton read and published 1 16 papers all his life, and his main works include two volumes of New System of Chemical Philosophy.

Discovery of Dalton's atomism

Although the conjecture that matter is made up of atoms has been put forward for a long time, it was not until the18th century, especially from the second half of the18th century to the middle of the19th century, that modern industry rose and science developed rapidly. People have deepened their understanding of atoms through production practice and a large number of chemical and physical experiments.

It is because of Dalton (1766- 1844), a chemistry teacher in the English missionary school, that atomism changed from speculation to scientific concept for the first time.

Dalton first studied the interesting conclusion found by the French chemist Proust in 1806: the mass of substances involved in chemical reactions presents a certain integer ratio (constant ratio law), such as 1 g hydrogen and 8 g oxidation to synthesize 9 g water. If this specific ratio is not followed, the excess will be left behind and will not participate in the combination.

Dalton himself found that when there are more than two compounds composed of two elements, if the amount of one element in these compounds is constant, the amount of the other element combined with it will always change exponentially (multiple proportional law).