CONSTRUCTION, TEST, AND CALIBRATION OF A HIGH-TEMPERATURE DIPHENYL ETHER DROP-TYPE CALORIMETER.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The Bunsen drop-type calorimeter, based on the heat required to melt a frozen substance, was first used about 1760 by Dr. Joseph Black. This type of calorimeter measures the expansion of the melting substance after a heated sample is dropped into the area of the frozen substance. A furnace designed for operation up to 1500C heats the sample, and diphenyl ether provides the working substance which forces mercury along a calibrated capillary tube. Testing has permitted calibration of the capillary and calculation of the amount of heat lost from a sample during its drop from the furnace to the calorimeter. The calculated calorimeter constant of 19.1 calg Hg displaced agrees reasonably with constants determined by other researchers. The results of initial testing of platinum and nickel show correlation with published data. Discussions of problems, and recommendations for further work give guidance for refinement of the equipment. Author