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| to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs |
| a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH3, usually produced by the combination of nitrogen and hydrogen gases |
| equivalent weight | |
| —n | |
| Also called: gram equivalent the weight of an element or compound that will combine with or displace 8 grams of oxygen or 1.007 97 grams of hydrogen | |