HARD a.
substantial, fundamental part or quality of anything; as, the hard pan of character, of a matter in dispute, etc. See Pan. -- Hard rubber. See under Rubber. -- Hard solder. See under Solder. -- Hard water, water, which contains lime or some mineral substance rendering it unfit for washing. See Hardness, 3.- Hard woo…
HEAT n.
amical theory of heat, that theory of heat which assumes it to be, not a peculiar kind of matter, but a peculiar motion of the ultimate particles of matter. Heat engine, any apparatus by which a heated substance, as a heated fluid, is made to perform work by giving motion to mechanism, as a hot-air engine, or a steam e…