A substance capable of causing cancer.
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CALM BELT
l. The doldrum sides of the trade winds, called calms of Cancer and calms of Capricorn, respectively
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NORTH TEMPERATE ZONE
That part of the earth between the Tropic of Cancer and the Arctic Circle.
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TORRID ZONE
The region of the earth between the Tropic of Cancer and the Tropic of Capricorn. Also called the TROPICS.
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TROPIC
Either of the two parallels of declination (north or south), approximately 23°27' from the celestial equator, reached by the sun at its maximum declination, or the corresponding parallels on the earth. The northern of these is called the TROPIC OF CANCER and the southern, the TROPIC OF CAPRICORN. The region of the earth between these two parallels is called the TORRID ZONE, or often the TROPICS.
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HAZARDOUS AIR POLLUTANTS
Chemicals that are known or suspected to cause cancer or other serious health effects, such as reproductive effects or birth defects, or adverse environmental effects. Listed hazardous air pollutants include benzene, found in gasoline; perchlorethlyene, emitted from some dry cleaning facilities; and methylene chloride, used as a solvent and paint stripper in industry; as well as dioxin, asbestos, toluene, and metals such as cadmium, mercury, harmonic vibration See harmonic motion.
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COMPOUND
(1) chemically speaking, a distinct substance formed by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements. (2) in petroleum processing, generally connotes fatty oils and similar materials foreign to petroleum added to lubricants to impart special properties.
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AIR
A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.
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ACIDIC
The reaction of a substance with water resulting in an increase in concentration of hydrogen ions in solution (see acid).
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FLUID
A substance readily assuming the shape of the container in which it is placed; e.g. oil, gas, water or mixtures of these. A general classification including liquids and gases.
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CATALYST
A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.
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