Today's Rocket Words: Your 5 words and meanings to learn

Democritus

Greek philosopher who developed one of the first atomist theories of the universe.

theory

A set of principles on which the practice of an activity is based.

ratio

The relationship between two groups or amounts that expresses how much bigger one is than the other.

atomos

The Greek word for atom; a basic unit of matter in science.

John Dalton (1766-1844)

English chemist and physicist who formulated atomic theory and the law of partial pressures; he gave the first description of red-green colour blindness.

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