Modified Adiabatic Calorimeter

A modified adiabatic type calorimeter, capable of measuring the heat capacities of natural and synthetic organic liquids in the temperature range of 100° to 500°F, was designed, constructed, and calibrated. In this calorimeter a fixed rate of power is supplied to the sample, and a bath which surrounds the sample container is maintained at the same temperature in order to prevent heat losses from the sample. The heat capacity of an unknown material may be calculated from measurements of the time rate of temperature rise, heat input, and mass of the sample. The calorimeter was calibrated with materials of known heat capacity and the following relation between the calorimeter constant and temperature was obtained: K(T)=0.256−3.706×10−5t+6.839×10−7t2.