Properties of isobutane

Thermophysical properties for isobutane (CAS: 75-28-5). Use the selector below to view properties in different unit systems.

Unit System

Calculation Conditions

The following state-dependent properties were calculated at these standard conditions.

Temperature

25 °C

Pressure

1.01325 bar

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Identification

Atoms
C: 4, H: 10
CAS
75-28-5
Formula
C4H10
ID
75-28-5
InChI
C4H10/c1-4(2)3/h4H,1-3H3
InChI Key
NNPPMTNAJDCUHE-UHFFFAOYSA-N
IUPAC Name
2-methylpropane
Molecular Weight (kg)
58.1222
Phase
g
PubChem ID
6360
SMILES
CC(C)C
Synonyms

Physical Properties

Acentric factor
0.184
Critical pressure (bar)
36.29
Critical temperature (°C)
134.66
Critical volume (m³/kmol)
0.257748
Dipole moment
0.13
Melting temperature (°C)
-148.95
Normal boiling temperature (°C)
-11.749

State-dependent Properties

Compressibility factor
1
Density (kg/m³)
2.37569
Dynamic viscosity (cP)
0.00749842
Enthalpy of vaporization (mass) (kJ)
328.921
Enthalpy of vaporization (molar) (kJ/kmol)
1.9118e+4
Gibbs free energy (kJ/kmol)
0
Joule–Thomson coefficient
9.0623e-14
Kinematic viscosity
3.1563e-6
Molar enthalpy (kJ/kmol)
0
Molar entropy (kJ/(kmol·K))
0
Molar heat capacity (kJ/(kmol·K))
96.6385
Molar volume (m³/kmol)
24.4654
Parachor
Poynting correction factor
Prandtl number
0.738301
Saturation pressure (bar)
3.50669
Saturation temperature (°C)
-11.749
Solubility parameter
Specific enthalpy (kJ)
0
Specific entropy (kJ/kg·K)
0
Specific gravity
2.00575
Specific heat capacity (kJ/kg·K)
1.66268
Surface tension
0.0100045
Thermal conductivity
0.0168867
Thermal diffusivity
4.2751e-6

Safety Properties

Autoignition temperature (°C)
460
Flash point temperature (°C)
-273.15
Lower flammability limit
0.013
Upper flammability limit
0.098

Environmental Properties

Global warming potential
Ozone depletion potential

Failed Properties:

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