The Nyaya-Vaisheshika Physics
The four kinds of atoms are earth, water, fire, and air atoms. These have mass, number, weight, fluidity (or hardness), viscosity (or its opposite), velocity, characteristic potential colour, taste, smell, or touch, not produced by the chemical operation of heat. Akasha (space) is absolutely inert and structure-less being only as the substratum of sound, which is supposed to travel wave-like in the manifesting medium of air. Atomic combination is only possible with the four elements. Atoms cannot exist in an uncombined condition in the creation stage; atmospheric air however consists of atoms in an uncombined state. Read more »
akasha, elementary substance, four elements, hindus, molecule, vibratory motion, water fire 