Glossary Category:

Usage

The act of using something such as electrical power. One refers to electrical energy consumption as power usage over a period of time.

Useable

A term used to indicate that something is functional enough even though it is not completely perfect.

Vacuum

The lack of a substance in a space. A vacuum exists when all air has been removed from a container and there is an empty void with nothing in it.

Valleys

A term used in roofing to indicate where two planes of a roof surface come together.

Venturi

A term used to define a shaped restriction in a pipe where a flowing fluid accelerates under pressure to maintain a constant volumetric flow the same as at other locations in the pipe.