History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c39.s4.5
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c39.s4.5
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c39.s4.5
2 *Vayu*:—Various substances composed of *di-tanmatric* atoms,—kinds of *vayu*—must have been formed in the gaseous envelope in the second stage of cosmic evolution out of the proto-atoms of *akasa*. But they have either suffered a fresh transformation into substances of a more complex atomic structure, or have dissipitated into the *mono-tanmatric akasa*, out of which they took their rise. The one familiar example now surviving is atmospheric air. Water vapour is but water (*ap* ;) and smoke, fumes, etc. are but earth-particles in gaseous diffusion.