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O Odor: A quality of gases, liquids, or particles that stimulates to olfactory organ. Odorant: A substance added to an otherwise oderless, colorless and tasteless gas to give warning of gas leakage and to aid in leak detection. Order of Magnitude: The difference in two values measured by their logarithms. The quantity 100 (log=2.0) is an order of magnitude larger than the quantity 10 (log=1.0). Organic: Molecules whose characteristics depend on the presence of one or more carbon atoms. Outside Air: External air; the atmosphere exterior to a refrigerated or conditioned space. "Owl": An optical device which measures the average particle size of an essentially monodispersed aerosol by the angular degree of light polarization. Ozone: A gas whose molecules are composed of three oxygen atoms. Its
symbol is O3. It is an unstable gas which is
significantly toxic. The 1989 threshold level value for ozone was 0.1 part per
million for an eight hour time weighted average. |
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