Propane - Thermophysical Properties

Calculator for propane thermophysical properties at 25°C (77°F, 298K) and atmospheric pressure. Provides molecular weight, density, viscosity, thermal conductivity, specific heat, and other key thermodynamic properties of propane (C3H8).

Propane - Thermophysical Properties

Thermophysical properties of Propane (C3H8) at standard conditions (25°C / 77°F / 298K and atmospheric pressure).

Reference Properties

Molecular Weight: 44.097 g/mol
Critical Temperature: 96°C (205°F)
Critical Pressure: 4.26 MN/m² (618 psia)
Boiling Point: -42.2°C (-44°F)
Flammability: Yes

Property	Unit 1	Value 1	Unit 2	Value 2
Molecular Weight	g/mol	44.097	-	-
Specific Gravity of gas (air = 1)	-	1.52	-	-
Specific Volume	ft³/lb	8.84	m³/kg	0.552
Density of liquid at atmospheric pressure	lb/ft³	36.2	kg/m³	580
Vapor pressure at 25°C	psia	135.7	MN/m²	0.936
Absolute Viscosity	lbm/ft·s	5.38×10⁻⁶	cP	0.0074
Sound velocity in gas	m/s	253	-	-
Specific Heat (cp)	Btu/lb·°F	0.39	J/kg·K	1630
Specific Heat Ratio (cp/cv)	-	1.13	-	-
Gas constant (R)	ft·lb/lb·°R	35.0	J/kg·°C	188
Thermal Conductivity	Btu/hr·ft·°F	0.010	W/m·°C	0.017
Boiling Point	°F	-44	°C	-42.2
Latent Heat of Evaporation	Btu/lb	184	J/kg	428000
Freezing/Melting Point	°F	-309.8	°C	-189.9
Latent Heat of Fusion	Btu/lb	19.1	J/kg	44400
Critical Temperature	°F	205	°C	96
Critical Pressure	psia	618	MN/m²	4.26
Critical Volume	ft³/lb	0.073	m³/kg	0.0045
Heat of combustion	Btu/ft³	2450	kJ/kg	50340

Calculator

Inputs

Temperature (°C)

Pressure (atm)

Results

Molecular Weight-- g/mol

Specific Gravity of gas (air = 1)-- -

Density of liquid at atmospheric pressure-- kg/m³

Vapor pressure at 25°C-- MN/m²

Specific Heat (cp)-- J/kg·K

Thermal Conductivity-- W/m·°C

Critical Temperature-- °C

Critical Pressure-- MN/m²