[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D.](https://indike.org/pramana/ins.science.ray-1902) › v2.c34.146 # A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c34.146 A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c34.146 - **Language:** English ### [v2.c34.146](https://indike.org/pramana/ins.science.ray-1902.v2.c34.146) 2. Váyu. Various substances composed of di-Tanmátric atoms,—kinds of Váyu—must have been formed in the gaseous envelope in the second stage of cosmic evolution, out of the proto-atoms of Ákása. But they have either suffered a fresh transformation into substances of a more complex atomic structure, or have dissipated into the mono-Tanmátric Ákása, out of which they took their rise. The one familiar example now surviving is atmospheric air. Water-vapour (वाष्प) is but water (Ap), and smoke, fumes, etc. but earth-particles in gaseous diffusion. - [Previous: v2.c34.145](https://indike.org/pramana/ins.science.ray-1902.v2.c34.145) - [Next: v2.c34.147](https://indike.org/pramana/ins.science.ray-1902.v2.c34.147) - [Up: v2.c34](https://indike.org/pramana/ins.science.ray-1902.v2.c34) --- Source: [https://indike.org/pramana/ins.science.ray-1902.v2.c34.146](https://indike.org/pramana/ins.science.ray-1902.v2.c34.146) · Pramāṇa