Sacred Texts: The Classics

Aristotle: On The Hevens: Book IV: Chapter 5

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A thing then which has the one kind of matter is light and always moves upward, while a thing which has the opposite matter is heavy and always moves downward. Bodies composed of kinds of matter different from these but having relatively to each other the character which these have absolutely, possess both the upward and the downward motion. Hence air and water each have both lightness and weight, and water sinks to the bottom of all things except earth, while air rises to the surface of all…

Aristotle: On The Hevens: Book IV: Chapter 5

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