Word: nitrogen
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Dates: during 1920-1929
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...Professor of Chemistry, for two years, for research connected with the determination of atomic weights through the density and compressibilities of gases. Results obtained with oxygen and helium have proved very valuable, and it is hoped that in the immediate future the studies may include experiments on hydrogen, nitrogen, and some of the rare gases...
...EARTH-Archibald MacLeish-Houghton-Mifflin ($1.25). Death is the beginning of creation. Science explains: "The Nitrogen Cycle. . . ." Poet MacLeish says...
Harry A. Curtis, Yale Professor of Chemical Engineering, who directed a recent world nitrogen survey for Mr. Hoover...
...experimenters of the Department of the Interior, according to their claim, have found that, by mixing helium instead of nitrogen with oxygen, a breathing mixture is formed equally as good as ordinary air, and the helium has not the tendency to "bubble" and cause the disease when the pressure is released...
Ordinary air is composed of four-fifths nitrogen and one-fifth oxygen and smaller amounts of other gases such as carbon dioxide. The oxygen content of air is the only part valuable to man in breathing. When men work in certain types of caissons, in diving suits or diving bells, they are subject to great air pressure. Under these circumstances, nitrogen goes into the tissues of the body. When the external pressure is released, as by coming out of a caisson or being raised to the surface of the water, the excess nitrogen in human tissues tends to form bubbles...