Ultra-stable pressure is realized for Chinese single pressure refractive index gas thermometry in the range 30–90 kPa

Abstract

The SPRIGT team in TIPC has achieved the most stable long-term pressure in the world in the range from 30 to 90 kPa. The pressure instability is less than 0.1 ppm (0.0032 Pa at 30 kPa, 0.009 Pa at 90 kPa), which can build the foundation for the success of SPRIGT.