Show hot liht light light is a phenomenon which manifests itself when matter reaches a high temperature obviously when energy is employed in heating a substance just in order that it shall give light there is waste of energy when heat is produced also an ordinary electric light bulb is hot to the touch when it is activated by an electric current and the heat it generates is wasted energy science has worked for generations on the problem of producing light without at the same time producing unwanted heat the te cold light given out by a glowworm has not yet been even approximately copied by our science but the new fluorescent light that is is being developed is a notable step forward i |