US 11,656,163 B2
Method for measuring the vapor pressure of liquid and solid substances
Josef Lutz, Rohrau (AT)
Assigned to GRABNER INSTRUMENTS MESSTECHNIK GMBH, Vienna (AT)
Appl. No. 16/762,687
Filed by GRABNER INSTRUMENTS MESSTECHNIK GMBH, Vienna (AT)
PCT Filed Nov. 8, 2018, PCT No. PCT/AT2018/000090
§ 371(c)(1), (2) Date May 8, 2020,
PCT Pub. No. WO2019/094994, PCT Pub. Date May 23, 2019.
Claims priority of application No. A 446/2017 (AT), filed on Nov. 14, 2017.
Prior Publication US 2021/0172846 A1, Jun. 10, 2021
Int. Cl. G01N 7/14 (2006.01)
CPC G01N 7/14 (2013.01) 12 Claims
OG exemplary drawing
 
1. A method for measuring a vapor pressure of liquid and solid substances, comprising:
arranging a sample of the substance in a variable volume of a measuring cell,
closing the measuring cell in a gas-tight manner,
increasing the variable volume of the measuring cell until reaching a measuring volume,
measuring at least one first measured value of a gas pressure prevailing after the increase in volume,
reducing a transition volume of the measuring cell until reaching the measuring volume,
measuring at least one second measured value of a gas pressure prevailing after the reduction of the volume, and
calculating the vapor pressure from the at least one first measured value and the at least one second measured value.