Optical Determination of the Compressibility of Solid Argon

Abstract
The compressibility of solid argon was measured in the temperature range 78° to 84°K by a new optical method. A value for the coefficient of thermal expansion was also obtained. The results are kT=(6.65±0.19)×10−11cm2dyn−1 at 78°K and β=(1.95±0.07)×10−3(K)−1 at 81°K. The experimental method is discussed and the results compared with existing experimental data.