Urethane A plastic material that is often foamed to a shape and allowed to harden. It can be used in a film or sheet for paint
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.
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