Anaximenes of Miletus (circa 585 BCE – c. 525 BCE) was a Greek philosopher. He s said to have been the friend of Anaximander and was also a member of the Ionian school.

He believed that air was the substance of all things. For example, when air is thinned out, he thought, it turns heated and becomes fire. When air is thickened, it condenses and becomes water and solid matter while when it condenses, it becomes earth.[1]

It is known now that these theories are wrong. But the idea that all things are made up of matter questioned the mind of yet another scientist, Leucippus. This led to one of the most important scientific discoveries introduced by the Greeks, the concept of atoms.

See also


  1. The New American Desk Encyclopedia, Penguin Group, 1989
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