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AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/acetylene
Quick Reference
| Formula / Notation | C2H2 |
|---|---|
| CAS Number | 74-86-2 |
| Molecular Weight | 26.04 |
| Melting Point | -119 °F (Sublimes) (NIOSH, 2024) |
| Boiling Point | -119 °F at 760 mmHg (USCG, 1999) |
| Density | 0.613 at -112 °F (USCG, 1999) - Less dense than water; will float |
| Solubility | 2 % (NIOSH, 2024) |
| Appearance | Acetylene appears as a colorless gas with a faint garlic-like odor. Easily ignited and burns with a sooty flame. Gas is lighter than air. Flame may flash back to the source of a leak very easily. U... |
| Also Known As | Ethyne; Narcylen; Ethine; Acetylen; Vinylene; 74-86-2; OC7TV75O83; DTXSID6026379; CHEBI:27518; acetylene;ethyne |
| Category | Organic Compounds |
What is Acetylene?
Acetylene is a gas molecular entity, an alkyne and a terminal acetylenic compound.
Formula & Notation
C2H2
IUPAC Name: acetylene
Other Names / Synonyms: Ethyne; Narcylen; Ethine; Acetylen; Vinylene; 74-86-2; OC7TV75O83; DTXSID6026379; CHEBI:27518; acetylene;ethyne
Properties & Characteristics
Appearance: Acetylene appears as a colorless gas with a faint garlic-like odor. Easily ignited and burns with a sooty flame. Gas is lighter than air. Flame may flash back to the source of a leak very easily. U.... Molecular formula: C2H2. Molecular weight: 26.04 g/mol. Boiling point: -119 °F at 760 mmHg (USCG, 1999). Melting point: -119 °F (Sublimes) (NIOSH, 2024). Density: 0.613 at -112 °F (USCG, 1999) - Less dense than water; will float. Solubility: 2 % (NIOSH, 2024). Vapor pressure: 44.2 atm (NIOSH, 2024). LogP: 0.4.
Physical Data
| Property | Value |
|---|---|
| Melting Point | -119 °F (Sublimes) (NIOSH, 2024) |
| Boiling Point | -119 °F at 760 mmHg (USCG, 1999) |
| Density | 0.613 at -112 °F (USCG, 1999) - Less dense than water; will float |
| Molecular Weight | 26.04 |
| Solubility | 2 % (NIOSH, 2024) |
| Appearance | Acetylene appears as a colorless gas with a faint garlic-like odor. Easily ignited and burns with a sooty flame. Gas is lighter than air. Flame may flash back to the source of a leak very easily. U... |
Uses & Applications
Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.
Safety Information
Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Term
Acetylene
Formula
C2H2
CAS Number
74-86-2
Molecular Weight
26.04
Category
Organic Compounds
Index
All "A" terms
Synonyms
Ethyne; Narcylen; Ethine; Acetylen; Vinylene; 74-86-2; OC7TV75O83; DTXSID6026379; CHEBI:27518; acetylene;ethyne
Frequently Asked Questions
Acetylene is a gas molecular entity, an alkyne and a terminal acetylenic compound.
Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.
Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.
The formula or notation for Acetylene is: C2H2
More "A" Terms
4-Aminobenzoic acid
C7H7NO2
Absolute Entropy of a Substance
S°
Absolute Zero
0 K = −273.15°C
Absorption Spectrum
E = hν; A = εlc
Accuracy
Acenaphthene
C12H10
Acetaldehyde
C2H4O
Acetic Acid
CH₃COOH (C₂H₄O₂)
Acetic anhydride
C4H6O3
Acetone
C3H6O
Acetonitrile
C2H3N
Acetophenone
C8H8O
View all "A" terms →
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.