...extremely small hole were made in such a body, heat would be radiated through the hole in proportion to the difference of the fourth powers of the absolute temperatures of the black body and the surrounding objects. BOLTZMANN AND STEFAN'S LAW. See Stefan and Boltzmann's law....

...examination of the results, was able to state them in the law that the radiation was proportional to the difference of the fourth powers of the absolute temperatures of the thermometer and of the enclosing wall. Since by Prevost's law of exchanges (§ 254) each of these bodies...

...portion of the wall. The amount of heat passing across a given air space by radiation depends upon the difference of the fourth powers of the absolute temperatures of the surfaces inclosing the air space. The laws governing the rate of heat transmission by conduction and...

...energy (heat, for example) radiated from a black surface to a cooler black surface is proportional to the difference of the fourth powers of the absolute temperatures of the bodies. TEMPERATURE, ABSOLUTE. See Absolute temperature. TEMPERATURE GRADIENT. As used in this bulletin,...

...exposed to such radiant heat has been found to depend upon the condition of the surface of the body and the difference of the fourth powers of the absolute temperatures of the radiating and absorbing bodies. Black bodies absorb a relatively larger proportion of heat than bodies having surfaces...

...of heat radiation is equal to the product of the three factors, coefficient of emission, area, and difference of the fourth powers of the absolute temperatures of the radiating body and of the black receiving surface: P = kA (T.1 - Tb') k = A (TV - Tb') In this manner values...

...of electrical energy. The heat transferred from one body to another by radiation is proportional to the difference of the fourth powers of the absolute temperatures of the two bodies. While this is strictly true only of the ideal "black bodies," the variation is so small...

...the hot surfaces of the furnace and the angle of exposure to the cold surfaces of the boiler. (6) On the difference of the fourth powers of the absolute temperatures of the hot and cold surfaces. In any given steam generating apparatus, the first of the above conditions is...

...deflections varied inversely as the square of the distance. Since the quantity of radiation received varied as the difference of the fourth powers of the absolute temperatures of the radiator and receiver, it was necessary to vary the sensitivity of the bolometer in order to keep the...

...losses increase very rapidly with temperature difference, the loss being approximately proportional to the difference of the fourth powers of the absolute temperatures of the ?M and inner wall surface respectively — agreeably with Stefan's Law. He states also that radiation...