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Concentration PDF Print E-mail
Thursday, 16 November 2006 01:00
A Concentration is the relative amount of a substance mixed with another substance. An example is five PPM of Carbon Monoxide in air or 1 mg/l of iron in water.
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A Concentration is the amount of one material dispersed or distributed in a larger amount of another material
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A Concentration is amount of a chemical in a particular volume or weight of air, water, soil, or other medium. See parts per billion, parts per million. See parts per billion, parts per million.

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Operating a hand drill at the North American Aviation, Inc., [a] woman is in the control surface department assembling a section of the leading edge for the horizontal stabilizer of a plane (LOC)

by The Library of Congress

Palmer, Alfred T.,, photographer. Operating a hand drill at the North American Aviation, Inc., [a] woman is in the control surface department assembling a section of the leading edge for the horizontal stabilizer of a plane 1942 Oct. 1 transparency : color. Notes: Title from FSA or OWI agency caption. Transfer from U.S. Office of War Information, 1944. Subjects: Airplane industry Assembly-line methods World War, 1939-1945 Women--Employment Drilling United States--California- . . .

Part of the cowling for one of the motors for a B-25 bomber is assembled in the engine department of North American [Aviation, Inc.]'s Inglewood, Calif., plant (LOC)

by The Library of Congress

Palmer, Alfred T.,, photographer. Part of the cowling for one of the motors for a B-25 bomber is assembled in the engine department of North American [Aviation, Inc.]'s Inglewood, Calif., plant 1942 Oct. 1 transparency : color. Notes: Title from FSA or OWI agency caption. Transfer from U.S. Office of War Information, 1944. Subjects: North American Aviation, Inc. Airplane industry Assembly-line methods World War, 1939-1945 Women--Employment Bombers United States--California . . .

With careful Douglas training, women do accurate electrical assembly and installation work, Douglas Aircraft Company, Long Beach, Calif. (LOC)

by The Library of Congress

Palmer, Alfred T.,, photographer. With careful Douglas training, women do accurate electrical assembly and installation work, Douglas Aircraft Company, Long Beach, Calif. 1942 Oct. 1 transparency : color. Notes: Title from FSA or OWI agency caption. Transfer from U.S. Office of War Information, 1944. Subjects: Douglas Aircraft Company Airplane industry Women--Employment World War, 1939-1945 Assembly-line methods United States--California--Long Beach Format: Trans . . .

Women become skilled shop technicians after careful training in the school at the Douglas Aircraft Company plant, Long Beach, Calif. Most important of the many types of aircraft made at this plant are the B-17F ("Flying Fortress") heavy bomber, the A-20 (

by The Library of Congress

Palmer, Alfred T.,, photographer. Women become skilled shop technicians after careful training in the school at the Douglas Aircraft Company plant, Long Beach, Calif. Most important of the many types of aircraft made at this plant are the B-17F ("Flying Fortress") heavy bomber, the A-20 ("Havoc") assault bomber and the C-47 heavy transport plane for the carrying of troops and cargo 1942 Oct. 1 transparency : color. Notes: Title from FSA or OWI agency caption. Tra . . .
 

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