Dichlorodifluoromethane R 12

Overview

Engineering reference data for Dichlorodifluoromethane R 12 in gases and compressed air.

Key Formulas

Ideal Gas Law

$PV = nRT$

Pressure × Volume = moles × gas constant × temperature.

Boyle's Law

$P_1 V_1 = P_2 V_2$

At constant temperature.

Charles's Law

$\frac{V_1}{T_1} = \frac{V_2}{T_2}$

At constant pressure.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$V$	Volume	m³
$T$	Temperature	K
$R$	Gas constant	8.314 J/(mol·K)

Physical Properties

Dichlorodifluoromethane (R-12, CF₂Cl₂) is a chlorofluorocarbon refrigerant with the following characteristics:

Property	Value
Molecular Weight	120.93 g/mol
Boiling Point (1.013 bar)	−29.8 °C
Latent Heat of Vaporization (1.013 bar)	166.95 kJ/kg
Critical Temperature	112 °C
Critical Pressure	41.15 bar
Gas Density (1.013 bar, boiling point)	6.25 kg/m³

Liquid Properties

Property	Condition	Value
Density	1.013 bar, boiling point	1486 kg/m³
Density	250 K	1468 kg/m³
Density	300 K	1304 kg/m³
Specific Heat (cₚ)	250 K	0.902 kJ/(kg·K)
Specific Heat (cₚ)	300 K	0.980 kJ/(kg·K)
Dynamic Viscosity	250 K	336 × 10⁻⁶ N·s/m²
Dynamic Viscosity	300 K	213 × 10⁻⁶ N·s/m²
Thermal Conductivity	250 K	86.8 × 10⁻⁶ kW/(m·K)
Thermal Conductivity	300 K	68.6 × 10⁻⁶ kW/(m·K)
Liquid/Gas Equivalent	1.013 bar, 15 °C	292 vol/vol

Unit Conversions

Quantity	Conversion
Specific Volume	1 m³/kg = 16.02 ft³/lb = 27,680 in³/lb = 119.8 gal(US)/lb = 99.776 gal(UK)/lb
Specific Enthalpy/Energy	1 kJ/kg = 1 J/g = 0.23885 kcal/kg = 0.4299 Btu/lb = 0.0002778 kWh/kg

Saturated Properties Data

References

• Original Source