title: Surface-tension values
text: # Surface-tension values
  
  This is a table of surface tension values for some interfaces at the indicated temperatures. Note that the SI units millinewtons per meter $(mN·m^{−1})$ are equivalent to the cgs units dynes per centimetre $(dyn·cm^{−1}).$
  
  | Interface | Temperature | γ $(mN·m^{−1})$ |
  | - | - | - |
  | Water–air | 20 °C | 72.86 ± 0.05 |
  | Water–air | 21.5 °C | 72.75 |
  | Water–air | 25 °C | 71.99±0.05 |
  | Methylene iodide–air | 20 °C | 67.00 |
  | Methylene iodide–air | 21.5 °C | 63.11 |
  | Ethylene glycol–air | 25 °C | 47.3 |
  | Ethylene glycol–air | 40 °C | 46.3 |
  | Dimethyl sulfoxide–air | 20 °C | 43.54 |
  | Propylene carbonate–air | 20 °C | 41.1 |
  | Benzene–air | 20 °C | 28.88 |
  | Benzene–air | 30 °C | 27.56 |
  | Toluene–air | 20 °C | 28.52 |
  | Chloroform–air | 25 °C | 26.67 |
  | Propionic acid–air | 20 °C | 26.69 |
  | Butyric acid–air | 20 °C | 26.51 |
  | Carbon tetrachloride–air | 25 °C | 26.43 |
  | Butyl acetate–air | 20 °C | 25.09 |
  | Diethylene glycol–air | 20 °C | 30.09 |
  | Nonane–air | 20 °C | 22.85 |
  | Methanol–air | 20 °C | 22.50 |
  | Ethanol–air | 20 °C | 22.39 |
  | Ethanol–air | 30 °C | 21.55 |
  | Octane–air | 20 °C | 21.61 |
  | Heptane–air | 20 °C | 20.14 |
  | Ether–air | 25 °C | 20.14 |
  | Hexane-air | 20 °C | 17.9 |
  | Mercury–air | 20 °C | 486.5 |
  | Mercury–air | 25 °C | 485.5 |
  | Mercury–air | 30 °C | 484.5 |
  | NaCl–air | 1073 °C | 115 |
  | KClO3–air | 20 °C | 81 |
  | Water–1-Butanol | 20 °C | 1.8 |
  | Water–Ethyl acetate | 20 °C | 6.8 |
  | Water–Heptanoic acid | 20 °C | 7.0 |
  | Water–Benzaldehyde | 20 °C | 15.5 |
  | Water–transformer oil | 20 °C | 37.2 |
  | Water–Mercury | 20 °C | 415 |
  | Ethanol–Mercury | 20 °C | 389 |
  | Water–1,2-Dichloroethane | 20 °C | 30.5 ± 0.3 |
  | Water–α,α,α-trifluorotoluene | 20 °C | 38.0 ± 0.5 |
  | Water–nitrobenzene | 20 °C | 24.4 ± 0.2 |
  | Water–nitromethane | 20 °C | 16.0 ± 0.2 |
  | Water–propylene carbonate | 20 °C | 2.9 ± 0.1 |
  