Butane - Thermophysical Properties

Calculate and reference thermophysical properties of n-Butane (C4H10) at standard conditions (25°C, 298K, atmospheric pressure). Includes molecular weight, density, viscosity, specific heat, thermal conductivity, critical point parameters, and heat of combustion.

Butane - Thermophysical Properties

Thermophysical properties of n-Butane (C₄H₁₀) at standard conditions:

  • Temperature: 25°C (77°F, 298 K)
  • Pressure: Atmospheric (14.7 psia, 101.325 kPa)

Use the calculator below to compute properties based on selected units and input parameters.

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Results

Property Value-- Varies by property
PropertyValue (Imperial)Value (SI)Unit
Molecular Weight58.1258.12g/mol
Specific Gravity (air = 1)2.072.07dimensionless
Density of Liquid at atm37.5604lb/ft³, kg/m³
Vapor Pressure at 25°C35.40.244psia, MN/m²
Absolute Viscosity4.8×10⁻⁶0.007lbm/ft·s, cP
Sound Velocity in Gas708.66216ft/s, m/s
Specific Heat (cp)0.391675Btu/lb·°F, J/kg·K
Specific Heat Ratio (cp/cv)1.0961.096dimensionless
Gas Constant (R)26.56143ft·lb/lb·°R, J/kg·°C
Thermal Conductivity0.010.017Btu/hr·ft·°F, W/m·°C
Boiling Point31.2-0.4°F, °C
Latent Heat of Evaporation165.6386000Btu/lb, J/kg
Freezing/Melting Point-217-138°F, °C
Latent Heat of Fusion19.244700Btu/lb, J/kg
Critical Temperature306152°F, °C
Critical Pressure5503.8psia, MN/m²
Critical Volume0.0700.0043ft³/lb, m³/kg
Heat of Combustion2140049700Btu/lb, kJ/kg

Key Notes

  • Flammability: Butane is flammable
  • Phase Behavior: Butane is a gas at standard conditions but becomes liquid or solid at lower temperatures and/or higher pressures
  • Critical Point: At 306°F (152°C) and 550 psia (3.8 MN/m²), there is no phase change with pressure or heat addition
  • Triple Point: The temperature and pressure where gas, liquid, and solid phases coexist in thermodynamic equilibrium

References

For detailed properties at varying temperature and pressure, refer to:

  • Density and specific weight variation
  • Dynamic and kinematic viscosity variation
  • Specific heat capacity variation
  • Thermal conductivity variation