Methanol - Thermophysical Properties
Methanol, CH 3 -OH, is a colorless, fairly volatile liquid with a faintly sweet pungent odor, similar, but somewhat milder and sweeter than ethanol .
Methanol is toxic, and may cause blindness. The vapors are slightly heavier than air and may explode if ignited.
Methanol is used to make chemicals, to remove water from automotive and aviation fuels, as a solvent for paints and plastics, and as an ingredient in a wide variety of products.
The phase diagram of methanol is shown below the table.
Chemical, physical and thermal properties of ethanol:
Values are given for liquid at 25 o C /77 o F / 298 K and 1 bara, if not other phase, temperature or pressure given.
For full table with Imperial Units - rotate the screen!
| Property | Value | Unit | Value | Unit | Value | Unit | Value | Unit | |||
| Acidity (pK a1 ) | 15.3 | ||||||||||
| Autoignition temperature | 737 | K | 464 | °C | 867 | °F | |||||
| Boiling Point | 337.85 | K | 64.7 | °C | 148.5 | °F | |||||
| Critical density | 8.7852 | mol/dm 3 | 281 | kg/m 3 | 0.546 | slug/ft 3 | 17.6 | lb/ft 3 | |||
| Critical Pressure | 8.22 | MPa=MN/m 2 | 82.2 | bar | 81.1 | atm | 1192 | psi=lb f /in 2 | |||
| Critical temperature | 513.4 | K | 240.2 | °C | 464.4 | °F | |||||
| Critical Volume | 114 | cm 3 /mol | 0.003552456 | m 3 /kg | 1.831 | ft 3 /slug | 0.05690 | ft 3 /lb | |||
| Density (gas) at 0.17 bar | 6.87 | mol/m 3 | 0.220 | kg/m 3 | 0.00043 | slug/ft 3 | 0.0137 | lb/ft 3 | |||
| Density (liquid) | 24540 | mol/m 3 | 786.3 | kg/m 3 | 1.526 | slug/ft 3 | 49.09 | lb/ft 3 | |||
| Flammable, gas and liquid | yes | ||||||||||
| Flash point | 284 | K | 11 | °C | 52 | °F | |||||
| Gas constant , individual - R | 259.5 | J/kg K | 0.07208 | Wh/(kg K) | 1552 | [ft lb f /slug °R] | 48.23 | [ft lb f /lb °R] | |||
| Gibbs free energy of formation (gas) | -163 | kJ/mol | -5087 | kJ/kg | -2187 | Btu/lb | |||||
| Heat (enthalpy) of combustion (gas) | 726.1 | kJ/mol | 22661 | kJ/kg | 9.7 | Btu/lb | |||||
| Heat (enthalpy) of combustion (liquid) | -727 | kJ/mol | -22689 | kJ/kg | -9.8 | Btu/lb | |||||
| Heat (enthalpy) of formation (gas) | -205 | kJ/mol | -6398 | kJ/kg | -2751 | Btu/lb | |||||
| Heat (enthalpy) of formation (liquid) | -239 | kJ/mol | -7459 | kJ/kg | -3207 | Btu/lb | |||||
| Heat (enthalpy) of fusion at -143°F/-97°C | 3.18 | kJ/mol | 99 | kJ/kg | 42.67 | Btu/lb | |||||
| Heat (enthalpy) of evaporation | 37.34 | kJ/mol | 1165 | kJ/kg | 501.01 | Btu/lb | |||||
| Specific heat capacity , Cp (gas) at 0.17 bar | 116 | J/mol K | 3.62 | kJ/kg K | 0.865 | Btu/lb°F or cal/g K | |||||
| Specific heat capacity, Cp (liquid) | 81.2 | J/mol K | 2.53 | kJ/kg K | 0.605 | Btu/lb°F or cal/g K | |||||
| Specific heat capacity, Cp (solid) at -148°F/-100°C | 105 | J/mol K | 3.28 | kJ/kg K | 0.783 | Btu/lb°F or cal/g K | |||||
| Specific heat capacity, Cv (gas) at 0.17 bar | 94.5 | J/mol K | 2.95 | kJ/kg K | 0.704 | Btu/lb°F or cal/g K | |||||
| Specific heat capacity, Cv (liquid) | 67.9 | J/mol K | 2.12 | kJ/kg K | 0.506 | Btu/lb°F or cal/g K | |||||
| Ionization potential | 10.84 | eV | |||||||||
| log K OW (Octanol/Water Partition Coefficient) | -0.77 | ||||||||||
| Melting point | 175.55 | K | -97.6 | °C | -143.7 | °F | |||||
| Molecular Weight | 32.042 | g/mol | 0.07064 | lb/mol | |||||||
| Solubility in water | 1000 | mg/ml | (Miscible in water) | ||||||||
| Sound velocity in gas, at 0.17 bar | 297 | m/s | 974 | ft/s | 665 | mi/h | |||||
| Sound velocity in liquid | 1100 | m/s | 3608 | ft/s | 2464 | mi/h | |||||
| Specific Gravity (gas) (relativ to air) | 1.11 | ||||||||||
| Specific Gravity (liquid) (relativ to water) | 0.79 | ||||||||||
| Specific Heat Ratio (gas) - cp/cv | 1.23 | ||||||||||
| Specific Heat Ratio (liquid) - cp/cv | 1.20 | ||||||||||
| Specific Volume (gas) 0.17 bar | 0.146 | m 3 /mol | 4.55 | m 3 /kg | 2342.63 | ft 3 /slug | 72.81 | ft 3 /lb | |||
| Specific Volume (liquid) | 0.0000408 | m 3 /mol | 0.00127 | m 3 /kg | 0.655 | ft 3 /slug | 0.0204 | ft 3 /lb | |||
| Standard molar entropy , S° (gas) | 240 | J/mol K | 7.49 | kJ/kg K | 1.79 | Btu/lb °F | |||||
| Standard molar entropy, S° (liquid) | 127 | J/mol K | 3.96 | kJ/kg K | 0.95 | Btu/lb °F | |||||
| Surface tension | 22.07 | dynes/cm | 0.02207 | N/m | |||||||
| Thermal Conductivity | 0.202 | W/m°C | 0.116713 | Btu/hr ft °F | |||||||
| Triple point pressure | 1.86*10 -7 | MPa=MN/m 2 | 1.86*10 -6 | bar | 1.84*10 -6 | atm | 2.70*10 -5 | psi=lbf/in 2 | |||
| Triple point temperature | 175.50 | K | -97.7 | °C | -143.77 | °F | |||||
| Vapor (saturation) pressure | 0.0169 | MPa=MN/m 2 | 127.0 | mm Hg | 0.1671 | atm | 2.46 | psi=lbf/in 2 | |||
| Viscosity , dynamic (absolute) | 0.544 | cP | 365.55 | [lbm /ft s*10 -6 ] | 11.36 | [lbf s/ft 2 *10 -6 ] | |||||
| Viscosity , kinematic | 0.692 | cSt | 7.4 | [ft 2 /s*10 -6 ] | |||||||
Follow the links below to get values for the listed properties of methanol at varying pressure and temperature :
See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Hydrogen sulfide , Methane , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D 2 O .
Methanol is a liquid at standard conditions. However, at low temperature and/or very high pressures it becomes a solid.
The phase diagram for methanol shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the methanol boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.
At the critical point there is no change of state when pressure is increased or if heat is added.
The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.
Related Topics
• Fluid Mechanics
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• Material Properties
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
• Thermodynamics
Work, heat and energy systems.
Related Documents
Acetone - Thermophysical Properties
Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.
Air - Thermophysical Properties
Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more.
Ammonia - Thermophysical Properties
Chemical, Physical and Thermal Properties of Ammonia. Phase diagram included.
Benzene - Thermophysical properties
Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.
Carbon Dioxide - Thermophysical Properties
Chemical, physical and thermal properties of carbon dioxide. Phase diagram included.
Ethanol - Thermophysical properties
Chemical, physical and thermal properties of ethanol (also called alcohol or ethyl alcohol). Phase diagram included.
Ethylene - Thermophysical Properties
Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.
Heavy Water - Thermophysical Properties
Thermodynamic properties of heavy water (D2O) like density, melting temperature, boiling temperature, latent heat of fusion, latent heat of evaporation, critical temperature and more.
Methane - Thermophysical Properties
Chemical, Physical and Thermal Properties of Methane - CH4. Phase diagram included.
Methanol - Density and Specific Weight vs. Temperature and Pressure
Online calculator, figures and tables showing density and specific weight of methanol,CH3OH, at varying temperature and pressure - Imperial and SI Units.
Methanol - Dynamic and Kinematic Viscosity vs. Temperature and Pressure
Online calculator, figures and tables showing dynamic and kinematic viscosity of liquid methanol,CH3OH, at varying temperature - Imperial and SI Units.
Pentane - Thermophysical Properties
Chemical, physical and thermal properties of pentane, also called n-pentane. Phase diagram included.
Water - Thermophysical Properties
Thermal properties of water at different temperatures like density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more.