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Glossary

Definitions:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Abbreviations       Organizations

U

Ultraclean

1 particle >10 micron per milliliter.

Unleaded Gasoline

Gasoline that derives its anti-knock properties from high-octane hydrocarbons or from non-lead anti-knock compounds, rather than from a lead additive. See lead alkyl.

Unloading

The release of contaminant that was initially captured by the filter medium.