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Glossary of Terms > V

Vacuum

An enclosed space from which air has been partially removed so that the gas remaining in the space exerts less pressure than the atmosphere.

Vacuum pump

A pump that removes gas from a sealed volume in order to leave behind a partial vacuum.

Velocity

Speed of motion. It is a vector physical quantity, both speed and direction are required to define it.

Volt

The SI unit of potential difference in a circuit.