Propyne

Propyne
Names
	Preferred IUPAC name Propyne
	Other names Methylacetylene; Methyl acetylene; Allylene
Identifiers
CAS Number	74-99-7 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	878138
ChEBI	CHEBI:48086 ;
ChEMBL	ChEMBL116902 ;
ChemSpider	6095;
ECHA InfoCard	100.000.754
EC Number	200-828-4;
MeSH	C022030
PubChem CID	6335;
UNII	086L40ET1B ;
CompTox Dashboard (EPA)	DTXSID0026387 ;
	InChI InChI=1S/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYSA-N; InChI=1/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYAI;
	SMILES CC#C;
Properties
Chemical formula	C3H4
Molar mass	40.0639 g/mol
Appearance	Colorless gas
Odor	Sweet
Density	0.53 g/cm3
Melting point	−102.7 °C (−152.9 °F; 170.5 K)
Boiling point	−23.2 °C (−9.8 °F; 250.0 K)
Vapor pressure	5.2 atm (20°C)
Hazards
Explosive limits	1.7%-?
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1000 ppm (1650 mg/m3)
REL (Recommended)	TWA 1000 ppm (1650 mg/m3)
IDLH (Immediate danger)	1700 ppm
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Propyne (methylacetylene) is an alkyne with the chemical formula CH₃C≡CH. It is a component of MAPD gas—along with its isomer propadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed.

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