flash point The lowest temperature at which a
liquid petroleum product gives off vapor in
sufficient concentration to ignite (that is,
flash) on application of a flame under
specified conditions.
jet fuel Fuel meeting the required properties for
use in jet engines and aircraft turbine
engines. Jet fuels are procured for the Armed
Forces in several grades. The most important
grades are JP-4 (low vapor pressure) and JP-
5 (high flash point), and JP-8.
Millipore test A test for particulate
contaminants in fuel supplies.
specific gravity The ratio of the weight of any
quantity of matter, a petroleum product for
example, to the weight of an equal quantity of
water; usually determined by use of a
hydrometer. (See AN Gravity.)
friction between unlike substances and in the
atmosphere; contrasted with voltaic or current
Glossary-2
QM 5094
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