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
GAGE PRESSURE: Pressure measured with respect
to atmospheric pressure.
GAS: A state of matter in which substances exist
in the form of nonaggregated molecules, and which,
within acceptable limits of accuracy, satisfies
the ideal gas laws: usually a highly superheated
GAS CHROMATOGRAPHY: A gaseous detection technique
which involves the separation of mixtures by passing
them through a column that will enable the components
to be held up for varying periods of time before
they are detected and recorded.
GERM: A microorganism; a microbe usually thought
of as a pathogenic organism.
GERMICIDE: An agent capable of killing germs.
GRAINS OF MOISTURE: The unit of measurement of
actual moisture contained in a sample of air.
(7000 grains = one pound of water).
GRAB SAMPLE: A sample which is taken within a
very short time period. The sample is taken to
determine the constituents at a specific time.
GRAM (g): A metric unit of weight. One ounce
equals 28.4 grams.
GRAM-NEGATIVE BACTERIA: Bacteria that do not
retain the crystal violet stain in their cells,
when stained by the procedure described by Christian
Gram, and thus appear pink or red when viewed
under the light microscope.
GRAM-POSITIVE BACTERIA: Bacteria that retain
the crystal violet stain in their cells when stained
by the procedure described by Christian Gram,
and thus appear blue or purple when viewed under
the light microscope.
GRILLE: A louvered covering for an opening through
which air passes.
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