Gas	Density (kg/m³)
	NTP	STP
Acetylene (C2H2)	1,092	1,17
Air	1,205	1.293
Ammonia (NH3)	0,717	0,769
Argón (Ar)	1,661	1,78
Butane (C4H10)	2,489	2,5
Carbon dioxide (C02)	1,842	1,977
Carbon monoxide (C0)	1,165	1,25
Chlorine (Cl2)	2,994	3,21
krypton (Kr)	-	3,73
Ethane (C2H6)	1,264	-
Ethyne (C2H4)	-	1,26
Fluorine (F2)	1,574	1,7
Helium (He)	0,1664	0,178
Hydrogen (H2)	0,0893	0,09
Hydrogen Chloride (HCl)	1,528	-
Hydrogen Sulfide (H2S)	1,434	-
Methane (CH4)	0,668	0,717
Neon (Ne)	-	0,90
Nitric Oxide (NO)	1,249	-
Nitrogen (N2)	1,165	1,25
Oxigen (O2)	1,331	1,429
Propane (C3H8)	1,882	-
Propene (C3H6)	1,748	-
Radon (Rn)	-	9,73
Sulfur Dioxide (SO2)	2,279	2,926
Xenon (Xe)	-	5,89

Gas density calculation

	Density relation up to ideal gas equations. d: Density P: Pressure T: Temperature

d1	=	d2	· (	P1	·	T2	) / (	P2	·	T1	)
g/cm³ g/l g/m³ g/ml g/mm³ kg/cm³ kg/l kg/m³ lb/ft³ lb/in³ lb/gal (UK) lb/gal (US) mg/cm³ mg/l mg/m³ oz (Av)/gal (UK) oz (Av)/gal (US) oz (Av)/ft³ oz (Av)/in³ t/m³		g/cm³ g/l g/m³ g/ml g/mm³ kg/cm³ kg/l kg/m³ lb/ft³ lb/in³ lb/gal (UK) lb/gal (US) mg/cm³ mg/l mg/m³ oz (Av)/gal (UK) oz (Av)/gal (US) oz (Av)/ft³ oz (Av)/in³ t/m³		at atm bar inH2O inHg kp/cm² kPa lbf/ft² lbf/in² mbar mca mce mH2O mmca mmce mmH2O mmHg mmWC mmWs MPa mWC mWs N/mm² Pa PSI torr		ºC ºF ºK ºR		at atm bar inH2O inHg kp/cm² kPa lbf/ft² lbf/in² mbar mca mce mH2O mmca mmce mmH2O mmHg mmWC mmWs MPa mWC mWs N/mm² Pa PSI torr		ºC ºF ºK ºR