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It is shown that pieces of sheet gold, copper, silver, or platinum may be made red hot or even melted by exposing them to active nitrogen produced in a low-pressure discharge. The nitrogen gives up its energy to the metal, which remains unacted on. This phenomenon is applied to measuring the energy of active nitrogen, drawing a known quantity of gas through the activating discharge and then over the metal, and measuring the energy liberated on the latter. The amount of energy collected from the gas was surprisingly large, and is difficult to reconcile with existing theories of the nature of active nitrogen. In some cases the energy was as high as 10 eV for every molecule of nitrogen that passed through the discharge. This quantity of energy can with difficulty be accounted for by dissociation, even if it occurred to the extent of 100%. The energy radiated as after-glow under favourable conditions is only of the order of 10-3 of the energy collected by the metal.

New studies on active nitrogen. II. Incandescence of metals in active nitrogen, and quantitative estimates of the energy liberated