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IAQ Glossary G

 

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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 vapor.

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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