This page provides supplementary chemical data on methanol.
== Safety Data Sheet == <!-- KEEP this header, it is linked to from the infobox on the main article page -->
The handling of this chemical may incur notable safety precautions. It is highly recommended that you seek the Safety Datasheet (SDS) for this chemical from a reliable source such as SIRI, and follow its directions. SDS is available at MSDS, J.T. Baker and Loba Chemie
== Structure and properties == <!-- KEEP this header, it is linked to from the infobox on the main article page -->
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! | Structure and properties
|-
| Index of refraction, n<sub>D</sub>
| 1.328 at 20 °C
|-
| Dielectric constant, ε<sub>r</sub>
| 32.66 at 20 °C <!-- Please omit if not applicable -->
|-
| Magnetic susceptibility
| 5.3×10<sup>−7</sup> cm<sup>3</sup>·g<sup>−1</sup>
|-
| Surface tension
| 22.5 dyn/cm at 20 °C
|-
| Viscosity
| 0.808 mPa·s at 0 °C<br>0.690 mPa·s at 10 °C<br>0.593 mPa·s at 20 °C<br>0.449 mPa·s at 40 °C<br>0.349 mPa·s at 60 °C
|-
|}
== Thermodynamic properties == <!-- KEEP this header, it is linked to from the infobox on the main article page -->
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! | Phase behavior
|-
| Triple point
| 175.5 K (−97.7 °C), 1.86·10<sup>−1</sup> Pa
|-
| Critical point
| 513 K (240 °C), 78.5 atm
|-
| Std enthalpy change<br/>of fusion, Δ<sub>fus</sub>H<sup><s>o</s></sup>
| 3.1773 kJ/mol
|-
| Std entropy change<br/>of fusion, Δ<sub>fus</sub>S<sup><s>o</s></sup>
| 18.1 J/(mol·K)
|-
| Std enthalpy change<br/>of vaporization, Δ<sub>vap</sub>H<sup><s>o</s></sup>
| 37.6 ± 0.5 kJ/mol
|-
| Std entropy change<br/>of vaporization, Δ<sub>vap</sub>S<sup><s>o</s></sup>
| 113 J/(mol·K)
|-
! | Solid properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>H<sup><s>o</s></sup><sub>solid</sub>
| ? kJ/mol
|-
| Standard molar entropy,<br/>S<sup><s>o</s></sup><sub>solid</sub>
| ? J/(mol K)
|-
| Heat capacity, c<sub>p</sub>
| ? J/(mol K)
|-
! | Liquid properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>H<sup><s>o</s></sup><sub>liquid</sub>
| −238.4 kJ/mol
|-
| Standard molar entropy,<br/>S<sup><s>o</s></sup><sub>liquid</sub>
| 127.2 J/(mol K)
|-
| Enthalpy of combustion Δ<sub>c</sub>H<sup><s>o</s></sup>
| −715.0 kJ/mol
|-
| Heat capacity, c<sub>p</sub>
| 70.8–90.5 J/(mol K) (at −97.6 to 64.7 °C)
79.9 J/(mol K) at 20 °C
|-
! | Gas properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>H<sup><s>o</s></sup><sub>gas</sub>
| −201.3 kJ/mol
|-
| Standard molar entropy,<br/>S<sup><s>o</s></sup><sub>gas</sub>
| 239.9 J/(mol K)
|-
| Heat capacity, c<sub>p</sub>
| 52.29 J/(mol K) at 77 °C<br>61.43 J/(mol K) at 100–223 °C
|-
| Heat capacity ratio,
| a = 964.9 L<sup>2</sup> kPa/mol<sup>2</sup><br> b = 0.06702 liter per mole
|-
|}
== Spectral data == <!-- KEEP this header, it is linked to from the infobox on the main article page -->
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! | UV-Vis
|-
| λ<sub>max</sub>
| ? nm
|-
| Extinction coefficient, ε
| ?
|-
! | IR
|-
| Major absorption bands
|
{|
|-
| colspan="2" align="center" | (liquid film)
|-
! Wave number !! transmittance
|-
| 3347 cm<sup>−1</sup> || 6%
|-
| 3336 cm<sup>−1</sup> || 8%
|-
| 2945 cm<sup>−1</sup> || 18%
|-
| 2833 cm<sup>−1</sup> || 22%
|-
| 2522 cm<sup>−1</sup> || 77%
|-
| 2046 cm<sup>−1</sup> || 84%
|-
| 1460 cm<sup>−1</sup> || 47%
|-
| 1116 cm<sup>−1</sup> || 62%
|-
| 1030 cm<sup>−1</sup> || 4%
|-
| 662 cm<sup>−1</sup> || 58%
|}
|-
! | NMR
|-
| Proton NMR <!-- Link to image of spectrum -->
| 3.97 ppm, 3.417 ppm<br>P = 760 mm Hg; T = 72.4 °C − 100.0 °C
|-
! rowspan="2" | BP<br>temp.<br>°C
! colspan="2" | % by mole methanol
|-
! liquid !! vapor
|-
| 100.00 || 0.0 || 0.0
|-
| 99.25 || 0.5840 || 4.5705
|-
| 96.9 || 1.2 || 11.4
|-
| 95.7 || 2.6 || 15.7
|-
| 92.2 || 5.0 || 29.3
|-
| 90.15 || 7.38 || 36.65
|-
| 87.5 || 10.2 || 43.0
|-
| 86.50 || 11.76 || 48.55
|-
| 84.8 || 14.0 || 51.4
|-
| 84.3 || 15.0 || 52.2
|-
| 82.9 || 17.5 || 56.0
|-
| 81.5 || 20.0 || 59.0
|-
| 78.0 || 30.0 || 67.5
|-
| 75.4 || 40.0 || 73.5
|-
| 73.7 || 47.3 || 76.5
|-
| 72.6 || 52.6 || 79.4
|-
| 72.4 || 54.0 || 80.1
|-
|}
|
|
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|-
| bgcolor="#D0D0D0" align=center colspan="3" | Vapor–liquid equilibrium<br>of methanol/water