A new method of determining the transition pressure of mercury at 0C as a fixed point of high pressures

Abstract

The solid-liquid phase transition pressure of mercury at 0℃ as a fixed point of high pressures is determined by a new method, the principle of which is to observe the transition from the change of temperature due to latent heat using thermoelements of semiconductors and to measure the pressure by the direct use of a lever type controlled-clearance piston gage with a large piston lately developed which operates in a state of no leak and no friction. The value obtained is 7, 571.0±1.2 bar (7, 720.3±1.2kgw/cm^2. The paper concludes with a brief comparison with the results of other investigations and some words desiring to find an opportunity of the international discussions on these results far establishing a International Practical Scale of High Pressures.