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2016 BCE
Aristotle
hypothesized that matter has a continuous composition that can be broken down into smaller and smaller pieces -
Democritus
He hypothesized that all matter is made up tiny discrete particles called atom"s which are too small to be seen by a naked eye -
John dalton
Suggested the matter is made up of small discrete particles which are like little solid balls -
Robert brown
Observed with a microscope that some dead pollen grains suspended in water were constantly moving about randomly in all directions.This known as the Brownian motion -
Albert Einstein
Explained that the dead pollen grains were moving because they were being bombarded by the moving water particles [atoms]