Precision Measurement of the Specific Heat of CO2near the Critical Point

Abstract

An experiment is reported in which the specific heat of a 1 mm high sample of C${\mathrm{O}}_2$ has been measured to within 12 mdeg of its critical temperature. The results show that the exponent $\alpha =\frac{1}{8}$ both above an below $T_c$, a value in agreement with the Ising model but inconsistent with scaling law analyses of existing $\mathrm{PVT}$ data.