Text-book of medical and pharmaceutical chemistry . r or iron turnings heated to red-ness ; the nitrogen pre-pared by both methods ^^- ^^- ^contains small quantitiesof other gases found inthe air. To prepare itpure, heat ammoniumnitrate (NH^NO,). NH^NO, + heat ^ 2H„0 + N, 183. Properties—Physical.—A color-less, transparent, odor-less, tasteless, incom-bustible gas, not a sup-porter of combustion or of animal respiration. It is not poisonous ; very sparingly sol-uble in water or alcohol. One part of water dissolves, at theordinary temperature and pressure .025 part of this gas. Chem-ically, nit
Text-book of medical and pharmaceutical chemistry . r or iron turnings heated to red-ness ; the nitrogen pre-pared by both methods ^^- ^^- ^contains small quantitiesof other gases found inthe air. To prepare itpure, heat ammoniumnitrate (NH^NO,). NH^NO, + heat ^ 2H„0 + N, 183. Properties—Physical.—A color-less, transparent, odor-less, tasteless, incom-bustible gas, not a sup-porter of combustion or of animal respiration. It is not poisonous ; very sparingly sol-uble in water or alcohol. One part of water dissolves, at theordinary temperature and pressure .025 part of this gas. Chem-ically, nitrogen is characterized by its inertness. It unitesdirectly with magnesium, boron, vanadium and titanium. In-directly, it forms a great number and variety of compounds,many of which are unstable. Under the influence of electricdischarges nitrogen can be caused to unite with hydrogen to formammonia, NH^, and with oxygen to form nitrous oxide. Fromthis source most of the nitrogenous products necessary to sustainplant life are primarily l6o MEDICAL CHEMISTRY. THE ATMOSPHERE. The atmosphere is a colorless, invisible, odorless mixture ofgases, which surrounds the earth. It is very elastic, and is there-fore most dense nearest the earths surface, upon which it exertsa pressure of about fifteen pounds to every square inch. Air wasfirst weighed by Otto Gerecke. looo c. c. of air at o° C. and760 millimeters of pressure, weighs gr^i- It is as heavy as hydrogen. 184. The Atmosphere is composed principally of nitrogenand oxygen mixed together in the proportion of P^rts ofoxygen, by volume, to parts of nitrogen, and, by weight,23 parts of oxygen to 77 parts of nitrogen. Although air is a mixture and not a definite compound, it isremarkably constant in composition. Regnault found in 233analyses of air, at different times and places, that the per cent, ofoxygen by volume varied between and That airis a mixture is proved by : ist, its
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