-
460 BCE
Democritus
hypothesised that all matter is made up of tiny discrete particles called atoms which are too small to be seen -
450 BCE
Aristotle
Hypothesised that matter has a continuous composition that can be broken down into smaller and smaller pieces -
John Dalton
Suggested that all matter is made up of small discrete particles that are solid -
Robert Brown
observed that small pollen grains which are dead suspended in water were constantly moving randomly in all direction it is called as brownian motion. -
Albert Einstine
explained that the dead pollen grain were moving because they were being bombarded by the moving water particles.
