Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Methanol - Thermophysical Properties

Chemical, physical and thermal properties of methanol, CH3OH (also called carbinol, wood alcohol, hydroxy methyl and methyl alcohol). Phase diagram included.

Sponsored Links

Methanol, CH3-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 25oC /77oF / 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 (pKa1) 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/dm3 281 kg/m3 0.546 slug/ft3 17.6 lb/ft3
Critical Pressure 8.22 MPa=MN/m2 82.2 bar 81.1 atm 1192 psi=lbf/in2
Critical temperature 513.4 K 240.2 °C 464.4 °F
Critical Volume 114 cm3/mol 0.003552456 m3/kg 1.831 ft3/slug 0.05690 ft3/lb
Density (gas) at 0.17 bar 6.87 mol/m3 0.220 kg/m3 0.00043 slug/ft3 0.0137 lb/ft3
Density (liquid) 24540 mol/m3 786.3 kg/m3 1.526 slug/ft3 49.09 lb/ft3
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 lbf/slug °R] 48.23 [ft lbf/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
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
Heat capacity, Cp (liquid) 81.2 J/mol K 2.53 kJ/kg K 0.605 Btu/lb°F or cal/g K
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
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
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 KOW (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 m3/mol 4.55 m3/kg 2342.63 ft3/slug 72.81 ft3/lb
Specific Volume (liquid) 0.0000408 m3/mol 0.00127 m3/kg 0.655 ft3/slug 0.0204 ft3/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/m2 1.86*10-6 bar 1.84*10-6 atm 2.70*10-5 psi=lbf/in2
Triple point temperature 175.50 K -97.7 °C -143.77 °F
Vapor (saturation) pressure 0.0169 MPa=MN/m2 127.0 mm Hg 0.1671 atm 2.46 psi=lbf/in2
Viscosity, dynamic (absolute) 0.544 cP 365.55 [lbm /ft s*10-6] 11.36 [lbf s/ft2 *10-6]
Viscosity, kinematic 0.692 cSt 7.4 [ft2/s*10-6]

Back to top

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, D2O.

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.

Methanol phase diagram

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.

Back to top

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: methanol methyl alcohol properties CH3OH
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2018). Methanol - Thermophysical Properties. [online] Available at: https://www.engineeringtoolbox.com/methanol-methyl-alcohol-properties-CH3OH-d_2031.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

12 7

Sponsored Links
.