Editing Ethylene oxide (section)

==Physical properties==
Ethylene oxide is a colorless gas at {{convert|25|C|}} and is a mobile liquid at {{convert|0|C|}} – viscosity of liquid ethylene oxide at 0&nbsp;°C is about 5.5 times lower than that of water. The gas has a characteristic sweet odor of ether, noticeable when its concentration in air exceeds 500{{nbsp}}ppm.<ref name="atsdr">{{cite web
| url=http://www.atsdr.cdc.gov/MHMI/mmg137.html
| title=Medical Management Guidelines for Ethylene Oxide
| work=Medical Management Guidelines (MMGs)
| publisher=Agency for Toxic Substances and Disease Registry
| access-date=29 September 2009
| url-status=dead
| archive-url=https://web.archive.org/web/20110606033044/http://www.atsdr.cdc.gov/MHMI/mmg137.html
| archive-date=6 June 2011
}}</ref> Ethylene oxide is readily soluble in water, [[ethanol]], [[diethyl ether]], and many organic solvents.<ref>{{cite web
| url=http://dic.academic.ru/dic.nsf/bse/154711/Этилена
| title=Этилена окись (Ethylene oxide)
| publisher=[[Great Soviet Encyclopedia]]
| access-date=25 September 2009
| language=ru
}}</ref>

Main thermodynamical constants are:<ref name="sch1">{{cite web |title=Термодинамические показатели органических соединений |lang=ru |date=1 April 2009 |publisher=ChemAnalitica.com |url=http://chemanalytica.com/book/novyy_spravochnik_khimika_i_tekhnologa/12_obshchie_svedeniya/6084 |access-date=21 September 2009}}</ref>
* The [[surface tension]] of liquid ethylene oxide, at the interface with its own vapor, is {{convert|35.8|mJ/m2||abbr=on}} at {{convert|-50.1|C|}} and {{convert|27.6|mJ/m2||abbr=on}} at {{convert|-0.1|C|}}.<ref>{{cite web |title=Surface tension of liquefied gas at the border with its own steam |date=1 April 2009 |publisher=ChemAnalitica.com |url=http://chemanalytica.com/book/novyy_spravochnik_khimika_i_tekhnologa/12_obshchie_svedeniya/6118 |access-date=21 September 2009}}</ref>
* The boiling point increases with the vapor pressure as follows:<ref>{{cite web |title=Boiling point or sublimation (°C) organic matter in the vapor pressure above 101.3 kPa |date=1 April 2009 |publisher=ChemAnalitica.com |url=http://chemanalytica.com/book/novyy_spravochnik_khimika_i_tekhnologa/12_obshchie_svedeniya/6061 |access-date=21 September 2009}}</ref> {{convert|57.7|C|}} ({{convert|2|atm|kPa psi|abbr=on}}), {{convert|83.6|C|}} ({{convert|5|atm|kPa psi|abbr=on}}), and {{convert|114.0|C|}} ({{convert|10|atm|kPa psi|abbr=on}}).
* [[Viscosity]] decreases with temperature with the values of 0.577{{nbsp}}kPa·s at {{convert|-49.8|C|}}, 0.488 kPa·s at {{convert|-38.2|C|}}, 0.394{{nbsp}}kPa·s at {{convert|-21.0|C|}}, and 0.320{{nbsp}}kPa·s at {{convert|0|C|}}.<ref>{{cite web |title=Viscosity of organic compounds |date=1 April 2009 |publisher=ChemAnalitica.com |url=http://chemanalytica.com/book/novyy_spravochnik_khimika_i_tekhnologa/12_obshchie_svedeniya/6112 |access-date=21 September 2009}}</ref>

Between {{convert|−91|and|10.5|C}}, vapor pressure ''p'' (in mmHg) varies with temperature (''T'' in °C) as
: <math>\lg p=6.251 - \frac{1115.1}{244.14 + T}</math>.<ref>{{cite web |title=Vapor pressure of organic compounds |date=1 April 2009 |publisher=ChemAnalitica.com |url=http://chemanalytica.com/book/novyy_spravochnik_khimika_i_tekhnologa/12_obshchie_svedeniya/6063 |access-date=21 September 2009}}</ref>

{| Class="wikitable" style="text-align:center"
|+ Properties of liquid ethylene oxide<ref name="ect"/>
|-
! Temperature, °C
! Vapor pressure, kPa
! Enthalpy of the liquid, J/g
! Enthalpy of vaporization, J/g
! Density, kg/L
! [[Heat capacity]], J/(kg·K)
! [[Thermal conductivity]], W/(m·K)
|-
| −40
| 8.35
| 0
| 628.6
| 0.9488
| 1878
| 0.20
|-
| −20
| 25.73
| 38.8
| 605.4
| 0.9232
| 1912
| 0.18
|-
| 0
| 65.82
| 77.3
| 581.7
| 0.8969
| 1954
| 0.16
|-
| 20
| 145.8
| 115.3
| 557.3
| 0.8697
| 2008
| 0.15
|-
| 40
| 288.4
| 153.2
| 532.1
| 0.8413
| 2092
| 0.14
|-
| 60
| 521.2
| 191.8
| 505.7
| 0.8108
| 2247
| 0.14
|-
| 80
| 875.4
| 232.6
| 477.4
| 0.7794
| 2426
| 0.14
|-
| 100
| 1385.4
| 277.8
| 445.5
| 0.7443
| 2782
| 0.13
|-
| 120
| 2088
| 330.4
| 407.5
| 0.7052
| 3293
| N/A*
|-
| 140
| 3020
| 393.5
| 359.4
| 0.6609
| 4225
| N/A
|-
| 160
| 4224
| 469.2
| 297.1
| 0.608
| N/A
| N/A
|-
| 180
| 5741
| 551.2
| 222.5
| 0.533
| N/A
| N/A
|-
| 195.8
| 7191
| N/A
| N/A
| N/A
| N/A
| N/A
|}
<nowiki>*</nowiki>N/A – data not available.

{| Class="wikitable" style="text-align:center"
|+ Properties of ethylene oxide vapor <ref name="ect"/>
|-
! Temperature, K
! Entropy, J/(mol·K)
! Heat of formation, kJ/mol
! Free energy of formation, kJ/mol
! Viscosity, μPa·s
! Thermal conductivity, W/(m·K)
! Heat capacity, J/(mol·K)
|-
| 298
| 242.4
| −52.63
| −13.10
| N/A
| N/A
| 48.28
|-
| 300
| 242.8
| −52.72
| −12.84
| 9.0
| 0.012
| 48.53
|-
| 400
| 258.7
| −56.53
| 1.05
| 13.5
| 0.025
| 61.71
|-
| 500
| 274.0
| −59.62
| 15.82
| 15.4
| 0.038
| 75.44
|-
| 600
| 288.8
| −62.13
| 31.13
| 18.2
| 0.056
| 86.27
|-
| 700
| 302.8
| −64.10
| 46.86
| 20.9
| 0.075
| 95.31
|-
| 800
| 316.0
| −65.61
| 62.80
| N/A
| 0.090
| 102.9
|}
<nowiki>*</nowiki>N/A – data not available.