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PHYSICAL PROPERTIES OF R-12 VERSUS CARE 30
Property (Metric Unit = Weight basis) R-12 R-134a CARE 30
Molecular weight 120.9 102.0 51.1
Boiling point @ 1 atmosphere (C) -29.8 -26.1 -31.5
Specific heat of liquid @ 30 C (kJ/kg L) 0.99 1.45 2.54
Specific heat of vapour at constant pressure @ 30 C, 1 atmosphere (kJ/kg K) 0.62 0.86 1.70
Ratio of specific heats (Cp/Cv) @ 1 atm., 30 C 1.136 1.118 1.116
Density of liquid @ 30C(Mg/m3) 1.292 1.187 0.517
Density of saturated vapour at boiling point (kg/m3) 7.3 5.3 2.6
Latent heat of vaporisation at boiling point (kJ/kg) 165 217 405
Thermal conductivity of liquid @ 20 C (W/mC) 0.07 0.08 0.1
Thermal conductivity of vapour @ 30C, 1 atm., (W/mC) 0.010 0.015 0.018
Surface tension @ 25C (mN/m) 8.5 8.4 8.6
Viscosity of @ 30 C(centipoise) 0.19 0.20 0.11
Viscosity of vapour at 1atm., 30 C (centipoise) 0.013 0.012 0.008

Property (Metric Unit - Molar basis) R-12 R-134a CARE 30
Molecular weight 120.9 102.0 51.1
Boiling point @ 1atmosphere (C) -29.8 -26.1 -31.5
Specific heat of liquid @ 30 C (MJ/kmol K) 0.12 0.15 0.13
Specific heat of vapour at constant pressure @ 30 C, 1 atmosphere (MJ/kmol K) 0.075 0.088 0.087
Ratio of specific heats (Cp/Cv) @ 1 atm., 30 C 1.136 1.140 1.116
Density of liquid @ 30 C (Mg/m3) 1.292 1.187 0.517
Density of saturated vapour at boiling point (kg/m3) 6.3 5.3 2.6
Latent heat of vaporisation at boiling point (MJ/kmol) 20.3 22.1 20.7
Thermal conductivity of liquid @ 20 C (W/m C) 0.07 0.08 0.1
Thermal conductivity of vapour @ 30 C, 1 atm., (W/mC) 0.010 0.015 0.018
Surface tension @ 25C (mN/m) 8.5 8.4 8.6
Viscosity of @ 30 C (centipoise)J 0.19 0.20 0.11
Viscosity of vapour at 1 atm., 30 C (centipoise) 0.013 0.012 0.008

[Exhibit]