Non‐adiabatic regime in modulation calorimetry

It is shown that the specific heat can be measured by a modulation technique in a nonadiabatic regime with the same accuracy as in an adiabatic regime. This is due to the fact that although the heat losses at non‐adiabatic conditions are large they can be accurately measured and taken into account. Moreover, in a non‐adiabatic regime it is possible to determine the specific heat and the temperature coefficient of the resistance of the sample by its heat transfer coefficient. The measurements can be made either using an ac bridge in order to determine the equivalent impedance of the sample or by a photoelectric method. Both the methods were experimentally checked on tungsten samples in the 1500 to 2700 K temperature range.