Ether is a volatile, colorless, inflammable liquid, composed of about 96 percent of absolute ethyl oxide and about 4 percent of alcohol containing a little water. Its specific gravity varies from 0.725 to 0.728 at 59° F., therefore it is lighter than water, but its vapor is heavier than air, with which it forms a highly explosive mixture. It evaporates quickly within the outdoors, producing a cooler effect. Its odor is robust and characteristic, its style hot and pungent. It dissolves oils, fats, resins, caoutchouc, most of the organic alkaloids, and lots of different substances. It is best prescribed as the Spirit of Ether, which mixes readily with water.