James Clerk Maxwell, who lived in the years 1831-1879, formulated the law of the decomposition of gas molecular velocity (assuming that gas was composed of chaotically moving molecules). He studied internal friction in gases. Basing on atomistics, he explained the slowness of diffusion. The most important of Maxwell's works were the ones of electromagnetism. He gathered Faraday's theories and ideas and put them into a mathematic form. Maxwell equalised the electric and magnetic fields. He foresaw electromagnetic waves subsistence and evaluated the velocity of their propagation in the empty space - the speed of light.