Calorimeter for determining specifi c heat capacities, conversion energies of materials, mixing temperatures as well as measurement of electrical equivalents of heat. Consists of a double-walled, heat -insulating plastic container with an insulating vessel inside made of refl ecting glass, with heating coil and stirrer. Also includes a lid with an opening for a thermometer and two 4 mm plugs for connecting the power supply for the heating coil If necessary, the heating coil can be removed from the inside of the lid.