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1) air pollution. The Columbia Encyclopedia, Sixth Edition. 2001
...air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The...

2) air forces. The Columbia Encyclopedia, Sixth Edition. 2001
...air forces, those portions of a nation's military organization employing heavier-than-air aircraft for reconnaissance, support of ground troops, aerial combat, and...

3) air. The American Heritage« Dictionary of the English Language: Fourth Edition. 2000.
...2a. The sky; the firmament. b. A giant void; nothingness: The money vanished into thin air. 3. An atmospheric movement; a breeze or wind. 4. Aircraft: send troops...

4) air conditioning. The Columbia Encyclopedia, Sixth Edition. 2001
...air conditioning, mechanical process for controlling the humidity, temperature, cleanliness, and circulation of air in buildings and rooms. Indoor air is conditioned...

5) The Chemical History of a Candle. Lecture V.-Oxygen Present in the Air-Nature of the Atmosphere-Its Properties-Other Products from the Candle-Carbonic Acid-Its Properties. Michael Faraday. 1909-14. Scientific Papers. The Harvard Classics
...candle. Hydrogen, you know, comes from the candle, and oxygen, you believe, comes from the air. But then you have a right to ask me, How is it that the air and the...

6) air mass. The Columbia Encyclopedia, Sixth Edition. 2001
...air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the...

7) air, law of the. The Columbia Encyclopedia, Sixth Edition. 2001
...air, law of the, in the broadest sense, all law connected with the use of the air, including radio and satellite transmissions; more commonly, it refers to laws concerning...

8) air-cushion vehicle. The Columbia Encyclopedia, Sixth Edition. 2001
...air-cushion vehicle, (ACV), craft designed to travel close to but above ground or water. It is also called a ground-effect machine or Hovercraft. These vehicles are...

9) Air Force, United States Department of the. The Columbia Encyclopedia, Sixth Edition. 2001
...Air Force, United States Department of the, military department within the U.S. Dept. of Defense (see Defense, United States Department of). The Air Force traces...

10) air-condition. The American Heritage« Dictionary of the English Language: Fourth Edition. 2000.
...Inflected forms: air-conĚdiĚtioned, air-conĚdiĚtionĚing, air-conĚdiĚtions To subject to, provide with, or ventilate by air conditioning....

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