THERMODYNAMIC PROPERTIES OF REFRIGERANTS .2. DENSITY OF REFRIGERANTS R11 AND R113 IN SINGLE-PHASE LIQUIDS IN THE TEMPERATURE-RANGE 250-450KAT PRESSURES REACHING 30 MPA

Results are given of quasi-isochoric pT-measurements in the liquid sin gle-phase region of the R11 and R113 refrigerants in the temperature r ange from 250 K To 450 K and at pressures of up to 30 MPa. The mole fr action of the impurities the samples under study amounted to less than 0,1.10(-3). The relative uncertainty of the measurements related to t he quotient pv/(RT) is smaller than 1,0.10(-3) on the 95 % confidence level. The measured data can be reproduced within the scope of the unc ertainty of measurement using a simply structured correlation equation with II adjustable parameters. A comparison with literature shows goo d agreement of the results with two equations of state and with experi mental data recently published and good extrapolating behaviour to hig her pressures of the correlation equation.