thermodynamics.gif (19136 bytes)

ABSORPTION BY A BLACK SURFACE








EQUIPMENT
    redball.gif (326 bytes) Black & Silver Surface Apparatus
    redball.gif (326 bytes) Thermocouple
    redball.gif (326 bytes) Galvanometer
    redball.gif (326 bytes) Steel Ball
   


NARRATIVE
            A black surface is connected to one junction of a thermocouple while a silver plate is connected to another junction of a thermocouple. A difference in temperature will cause a current to flow in the thermocouple circuit. Heat the steel ball until it is red hot. Connect the plates and thermocouple to a projection galvanometer so that the galvanometer will be deflected in the direction of the hotter plate. Place the hot steel ball between the plates and the galvanometer will be deflected to indicate that the black plate has absorbed more heat.