Oxygen

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  • Identifiers

    CAS number
    7782-44-7

    Molecular formula
    O2

    SMILES
    O=O

    Safety labels

    Oxidizer
    Oxidizer

    Compressed Gas
    Compressed Gas

  • Odor profile

    Fragrance
    Odorless 90.52%
    Sharp 24.22%
    Pungent 22.03%
    Burnt 19.67%
    Sour 18.57%
    Bitter 17.99%
    Caramellic 16.01%
    Ethereal 14.1%
    Almond 10.43%
    Fermented 10.33%

     

    Flavor
    Odorless 55.9%
    Pungent 36.71%
    Bitter 27.39%
    Vinegar 26.6%
    Rotten 25.85%
    Formyl 25.63%
    Almond 20.71%
    Decomposing cabbage 20.09%
    Cherry 19.24%
    Mousy 19.15%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -1.1

    pKa est.
    0.59 (strong acid)

    Molecular weight
    31.999 g/mol

    Melting point expt.

    • -361 °F (USCG, 1999)
    • -218.4 undefined
    • -218.4 °C
    • TRIPLE POINT TEMP: 54.4 DEG K; TRIPLE POINT PRESSURE: 0.0015 ATM; HEAT OF FUSION: 3.3 CAL/G
    • -361 °F

    Boiling point

    • -297.3 °F at 760 mmHg (USCG, 1999)
    • -183 undefined
    • -182.96 °C
    • -183 °C
    • -297.3 °F

    Flash point

    • 39.47 ˚C est.

    Solubility expt.

    • 39mg/L
    • 1 vol gas dissolves in 32 vol water at 20 °C, in 7 vol alcohol at 20 °C; sol in other organic liquids and usually to a greater extent than in water
    • 4.89 CU M SOL IN 100 CC WATER @ 0 °C; 2.46 CU M SOL IN 100 CC WATER @ 50 °C; 2.30 CU M SOL IN 100 CC WATER @ 100 °C; 2.78 G SOL IN 100 CC ALC @ 25 °C
    • 37.5 mg/mL at 21 °C
    • Solubility in water, ml/100ml at 20 °C: 3.1
    • Solubility in water, ml/100ml at 20 °C: 3.1

  • Synonyms

    • oxygen
    • 7782-44-7
    • O
    • Molecular oxygen
    • oxygen molecule
    • Dioxygen
    • Pure oxygen
    • Oxygenium
    • Hyperoxia
    • Liquid oxygen
    • Oxygen-16
    • Oxygen, liquified
    • oxygene
    • Oxygenium medicinale
    • Sauerstoff
    • Oxygen (liquid)
    • oxigeno
    • Compressed oxygen
    • CCRIS 1228
    • HSDB 5054
    • dioxygene
    • Disauerstoff
    • O2
    • Oxygen USP
    • EINECS 231-956-9
    • Oxygen, compressed
    • UN1072
    • UN1073
    • Oxygen [USP]
    • RNS60 COMPONENT OXYGEN
    • INS NO.948
    • RNS-60 COMPONENT OXYGEN
    • UNII-S88TT14065
    • CHEBI:15379
    • INS-948
    • E-948
    • S88TT14065
    • E948
    • Peroxide Ion
    • LOX
    • DTXSID2037681
    • Oxygen (USP)
    • E 948
    • OXYGEN (MART.)
    • OXYGEN [MART.]
    • Oxygene [French]
    • Oxigeno [Spanish]
    • OXY
    • OXYGEN (EP MONOGRAPH)
    • OXYGEN [EP MONOGRAPH]
    • OXYGEN (USP MONOGRAPH)
    • OXYGEN [USP MONOGRAPH]
    • (OO)
    • [OO]
    • Oxygen 16
    • dioxidanediyl
    • oxygen monoxide
    • oxygencompressed
    • Oxigeno gaseoso
    • Air Compressed
    • singlet dioxygen
    • triplet dioxygen
    • O2hundred
    • reconstituted Air
    • Oxygen Compressed
    • Oxygen Size B
    • Oxygen Size C
    • Oxygen Size D
    • Oxygen Size E
    • Oxygen Size F
    • Oxygen Size H
    • Oxygen Size M
    • Oxygen Size T
    • Oxygen, USP
    • G02 Therapy
    • Ez-OX Plus
    • Oxygen 93 percent
    • Oxygen Size 400
    • Focus Medical Oxygen
    • Ez-OX
    • Hyperbaric Chamber Mix
    • Vet O2
    • 0XYGEN
    • singlet molecular oxygen
    • triplet molecular oxygen
    • Oxygen (8CI,9CI)
    • OXYGEN [VANDF]
    • OXYGEN [HSDB]
    • OXYGEN [JAN]
    • Medical Oxygen Compressed
    • Oxygen (JP18/USP)
    • OXYGEN [WHO-DD]
    • OXYGEN [WHO-IP]
    • OXYGEN [MI]
    • dioxygen(2.) (triplet)
    • Oxygen, >=99.6%
    • OXYGEN [GREEN BOOK]
    • Oxygen, compressed [UN1072] [Nonflammable gas]
    • OXYGEN, (COMPRESSED)
    • Oxygen64889-0001
    • AIR COMPRESSEDMEDICAL AIR
    • Oxygen, >=99.998%
    • CHEMBL1234886
    • DTXCID0017681
    • CHEBI:26689
    • CHEBI:27140
    • Medical Gasseous Oxygen Cylinders
    • OXYGENIUM [WHO-IP LATIN]
    • Southern Medical Oxygen, Compressed
    • Oxygen, refrigerated liquid (cryogenic liquid) [UN1073] [Nonflammable gas]
    • DB09140
    • UN 1072
    • UN 1073
    • Oxygen, Messer(R) CANGas, 99.999%
    • DS-014940
    • (1)O2
    • NS00076229
    • C00007
    • D00003
    • O2(2.)
    • Oxygen, refrigerated liquid (cryogenic liquid)
    • Oxygen, compressed [UN1072] [Nonflammable gas]
    • (O2)(..)
    • (O2)(2.)
    • Q5203615
    • Oxygen4c21e554-d402-480d-896d-8185c05c7863
    • AQUANAL(TM)-plus oxygen (O2) 1-12 mg/L, refill pack for 37428
    • AQUANAL(TM)-plus oxygen (O2) 1-12 mg/L, test set with color comparator

  • Applications

    Oxygen (CAS 7782-44-7) is used as an industrial oxidant and process gas across multiple sectors, including: (1) steelmaking and metal fabrication where it supports controlled oxidation in furnaces and in oxy-fuel welding and cutting; (2) chemical manufacturing for oxidation reactions and oxidative processing in the production of organic chemicals; (3) energy and heating, where it acts as a combustion-support gas in oxy-fuel firing and high-temperature furnaces; (4) electronics and surface engineering, where oxygen plasma enables cleaning, etching, and surface modification; and (5) environmental and water treatment, where it is employed to aerate water and promote biological degradation.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 47.68
    methanol 78.47
    isopropanol 35.84
    water 7.31
    ethyl acetate 30.65
    n-propanol 30.3
    acetone 82.62
    n-butanol 24.36
    acetonitrile 67.54
    DMF 234.2
    toluene 9.41
    isobutanol 22.32
    1,4-dioxane 61.5
    methyl acetate 49.29
    THF 66.18
    2-butanone 46.29
    n-pentanol 16.39
    sec-butanol 25.7
    n-hexane 5.68
    ethylene glycol 33.44
    NMP 168.98
    cyclohexane 6.18
    DMSO 212.51
    n-butyl acetate 17.87
    n-octanol 14.18
    chloroform 39.83
    n-propyl acetate 18.78
    acetic acid 72.58
    dichloromethane 45.24
    cyclohexanone 44.25
    propylene glycol 23.64
    isopropyl acetate 19.39
    DMAc 170.75
    2-ethoxyethanol 36.72
    isopentanol 20.75
    n-heptane 4.81
    ethyl formate 28.57
    1,2-dichloroethane 33.31
    n-hexanol 13.9
    2-methoxyethanol 75.8
    isobutyl acetate 10.86
    tetrachloromethane 9.27
    n-pentyl acetate 14.97
    transcutol 81.03
    n-heptanol 9.7
    ethylbenzene 7.88
    MIBK 20.29
    2-propoxyethanol 32.13
    tert-butanol 43.09
    MTBE 31.2
    2-butoxyethanol 20.65
    propionic acid 43.09
    o-xylene 12.21
    formic acid 43.98
    diethyl ether 31.84
    m-xylene 8.62
    p-xylene 10.75
    chlorobenzene 16.01
    dimethyl carbonate 28.73
    n-octane 2.68
    formamide 71.6
    cyclopentanone 66.52
    2-pentanone 32.62
    anisole 22.32
    cyclopentyl methyl ether 28.9
    gamma-butyrolactone 84.7
    1-methoxy-2-propanol 54.44
    pyridine 44.26
    3-pentanone 30.01
    furfural 68.95
    n-dodecane 2.6
    diethylene glycol 35.96
    diisopropyl ether 10.83
    tert-amyl alcohol 31.23
    acetylacetone 40.76
    n-hexadecane 2.77
    acetophenone 23.68
    methyl propionate 36.83
    isopentyl acetate 15.88
    trichloroethylene 48.04
    n-nonanol 12.27
    cyclohexanol 21.58
    benzyl alcohol 17.85
    2-ethylhexanol 10.66
    isooctanol 8.37
    dipropyl ether 16.01
    1,2-dichlorobenzene 17.46
    ethyl lactate 16.15
    propylene carbonate 37.56
    n-methylformamide 91.42
    2-pentanol 18.17
    n-pentane 6.0
    1-propoxy-2-propanol 24.22
    1-methoxy-2-propyl acetate 23.11
    2-(2-methoxypropoxy) propanol 29.42
    mesitylene 7.39
    ε-caprolactone 39.67
    p-cymene 7.8
    epichlorohydrin 53.94
    1,1,1-trichloroethane 25.23
    2-aminoethanol 35.87
    morpholine-4-carbaldehyde 118.82
    sulfolane 111.61
    2,2,4-trimethylpentane 3.95
    2-methyltetrahydrofuran 43.98
    n-hexyl acetate 22.98
    isooctane 2.83
    2-(2-butoxyethoxy)ethanol 32.32
    sec-butyl acetate 12.85
    tert-butyl acetate 22.13
    decalin 3.9
    glycerin 39.41
    diglyme 65.57
    acrylic acid 51.23
    isopropyl myristate 11.53
    n-butyric acid 34.2
    acetyl acetate 23.32
    di(2-ethylhexyl) phthalate 11.4
    ethyl propionate 19.87
    nitromethane 123.49
    1,2-diethoxyethane 25.45
    benzonitrile 23.6
    trioctyl phosphate 9.09
    1-bromopropane 20.03
    gamma-valerolactone 77.89
    n-decanol 9.64
    triethyl phosphate 12.85
    4-methyl-2-pentanol 11.45
    propionitrile 36.41
    vinylene carbonate 34.91
    1,1,2-trichlorotrifluoroethane 54.31
    DMS 26.6
    cumene 7.15
    2-octanol 8.65
    2-hexanone 20.02
    octyl acetate 14.39
    limonene 11.45
    1,2-dimethoxyethane 63.97
    ethyl orthosilicate 11.72
    tributyl phosphate 10.94
    diacetone alcohol 32.61
    N,N-dimethylaniline 22.33
    acrylonitrile 54.22
    aniline 18.16
    1,3-propanediol 38.32
    bromobenzene 13.78
    dibromomethane 29.09
    1,1,2,2-tetrachloroethane 39.49
    2-methyl-cyclohexyl acetate 14.01
    tetrabutyl urea 18.21
    diisobutyl methanol 9.57
    2-phenylethanol 14.01
    styrene 10.57
    dioctyl adipate 17.36
    dimethyl sulfate 58.77
    ethyl butyrate 16.73
    methyl lactate 31.51
    butyl lactate 14.47
    diethyl carbonate 13.87
    propanediol butyl ether 24.12
    triethyl orthoformate 14.14
    p-tert-butyltoluene 7.84
    methyl 4-tert-butylbenzoate 24.64
    morpholine 67.68
    tert-butylamine 26.31
    n-dodecanol 8.12
    dimethoxymethane 71.47
    ethylene carbonate 27.63
    cyrene 29.58
    2-ethoxyethyl acetate 21.6
    2-ethylhexyl acetate 13.34
    1,2,4-trichlorobenzene 22.25
    4-methylpyridine 37.82
    dibutyl ether 15.52
    2,6-dimethyl-4-heptanol 9.57
    DEF 62.64
    dimethyl isosorbide 40.31
    tetrachloroethylene 29.17
    eugenol 23.64
    triacetin 26.78
    span 80 22.73
    1,4-butanediol 16.91
    1,1-dichloroethane 29.99
    2-methyl-1-pentanol 14.39
    methyl formate 62.39
    2-methyl-1-butanol 19.58
    n-decane 3.7
    butyronitrile 26.33
    3,7-dimethyl-1-octanol 12.74
    1-chlorooctane 9.42
    1-chlorotetradecane 5.2
    n-nonane 3.74
    undecane 3.02
    tert-butylcyclohexane 3.87
    cyclooctane 2.75
    cyclopentanol 29.19
    tetrahydropyran 37.13
    tert-amyl methyl ether 26.62
    2,5,8-trioxanonane 50.54
    1-hexene 11.34
    2-isopropoxyethanol 24.22
    2,2,2-trifluoroethanol 34.44
    methyl butyrate 26.8

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction