Abstract
Using an ultrasonic interferometer method, the sound velocity in gaseous mixture R-125 (63.9 wt. %) - R-134a (36.1 wt. %) was investigated in the temperature interval 303-393 K and pressure up to 0.95 MPa. The temperature measurement error was 20 mK, pressure 4 kPa, and sound velocity (0.2–0.3) %. It was shown that the sound velocity values increase with temperature and decrease with pressure. Comparison of our data with the calculations using the REFPROP software was performed.
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