Gas Physical Properties

Acetylene

Formula	C₂H₂
Molecular Weight (lb/mol)	26.04
Critical Temp. (°F)	96.0
Critical Pressure (psia)	906.0
Boiling Point (°F)	–119.6
Melting Point (°F)	–113.4
Psat @ 70°F (psia)	586.2
Liquid Density @ 70°F (lb/ft³)	23.61
Gas Density @ 70°F 1 atm (lb/ft³)	0.0677
Specific Volume @ 70°F 1 atm (ft³/lb)	14.76
Specific Gravity	0.920
Specific Heat @ 70°F (Btu/lbmol–°F)	10.53

Air

Formula	--
Molecular Weight (lb/mol)	28.96
Critical Temp. (°F)	N/A
Critical Pressure (psia)	N/A
Boiling Point (°F)	–317.8
Melting Point (°F)	N/A
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.075
Specific Volume @ 70°F 1 atm (ft³/lb)	13.3
Specific Gravity	1.000
Specific Heat @ 70°F (Btu/lbmol–°F)	6.96

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Ammonia

Formula	NH₃
Molecular Weight (lb/mol)	17.03
Critical Temp. (°F)	270.1
Critical Pressure (psia)	1636.0
Boiling Point (°F)	-28.2
Melting Point (°F)	–107.9
Psat @ 70°F (psia)	129.0
Liquid Density @ 70°F (lb/ft³)	38.55
Gas Density @ 70°F 1 atm (lb/ft³)	0.0445
Specific Volume @ 70°F 1 atm (ft³/lb)	22.48
Specific Gravity	0.604
Specific Heat @ 70°F (Btu/lbmol–°F)	8.69

Argon

Formula	Ar
Molecular Weight (lb/mol)	39.95
Critical Temp. (°F)	–188.4
Critical Pressure (psia)	705.8
Boiling Point (°F)	–302.6
Melting Point (°F)	–308.8
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.1034
Specific Volume @ 70°F 1 atm (ft³/lb)	9.67
Specific Gravity	1.38
Specific Heat @ 70°F (Btu/lbmol–°F)	4.98

Arsine

Formula	AsH₃
Molecular Weight (lb/mol)	77.95
Critical Temp. (°F)	211.8
Critical Pressure (psia)	957
Boiling Point (°F)	–79.9
Melting Point (°F)	–178.5
Psat @ 70°F (psia)	217.9
Liquid Density @ 70°F (lb/ft³)	92.59
Gas Density @ 70°F 1 atm (lb/ft³)	0.2038
Specific Volume @ 70°F 1 atm (ft³/lb)	4.91
Specific Gravity	2.769
Specific Heat @ 70°F (Btu/lbmol–°F)	9.23

Boron Trichloride

Formula	BCl₃
Molecular Weight (lb/mol)	117.17
Critical Temp. (°F)	353.8
Critical Pressure (psia)	561.3
Boiling Point (°F)	54.6
Melting Point (°F)	–160.6
Psat @ 70°F (psia)	19.9
Liquid Density @ 70°F (lb/ft³)	84.44
Gas Density @ 70°F 1 atm (lb/ft³)	0.3141
Specific Volume @ 70°F 1 atm (ft³/lb)	3.18
Specific Gravity	4.267
Specific Heat @ 70°F (Btu/lbmol–°F)	15.11

Boron Trifluoride

Formula	BF₃
Molecular Weight (lb/mol)	67.81
Critical Temp. (°F)	10.0
Critical Pressure (psia)	723.0
Boiling Point (°F)	–148.5
Melting Point (°F)	–199.7
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.1745
Specific Volume @ 70°F 1 atm (ft³/lb)	5.73
Specific Gravity	2.320
Specific Heat @ 70°F (Btu/lbmol–°F)	12.10

Butane

Formula	C₄H₁₀
Molecular Weight (lb/mol)	58.12
Critical Temp. (°F)	305.9
Critical Pressure (psia)	549.9
Boiling Point (°F)	31.0
Melting Point (°F)	—217.0
Psat @ 70°F (psia)	31.3
Liquid Density @ 70°F (lb/ft³)	36.05
Gas Density @ 70°F 1 atm (lb/ft³)	0.1551
Specific Volume @ 70°F 1 atm (ft³/lb)	6.45
Specific Gravity	2.108
Specific Heat @ 70°F (Btu/lbmol—°F)	23.87

Carbon Dioxide

Formula	CO₂
Molecular Weight (lb/mol)	44.01
Critical Temp. (°F)	87.9
Critical Pressure (psia)	1071.0
Boiling Point (°F)	–109.2
Melting Point (°F)	–69.9
Psat @ 70°F (psia)	852.8
Liquid Density @ 70°F (lb/ft³)	47.64
Gas Density @ 70°F 1 atm (lb/ft³)	0.1144
Specific Volume @ 70°F 1 atm (ft³/lb)	8.74
Specific Gravity	1.555
Specific Heat @ 70°F (Btu/lbmol–°F)	8.92

Carbon Monoxide

Formula	CO
Molecular Weight (lb/mol)	28.01
Critical Temp. (°F)	–220.4
Critical Pressure (psia)	485.6
Boiling Point (°F)	–312.7
Melting Point (°F)	–337.1
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0725
Specific Volume @ 70°F 1 atm (ft³/lb)	13.80
Specific Gravity	0.985
Specific Heat @ 70°F (Btu/lbmol–°F)	6.97

Chlorine

Formula	Cl₂
Molecular Weight (lb/mol)	70.91
Critical Temp. (°F)	291.2
Critical Pressure (psia)	1118.4
Boiling Point (°F)	–29.3
Melting Point (°F)	–149.8
Psat @ 70°F (psia)	98.4
Liquid Density @ 70°F (lb/ft³)	88.83
Gas Density @ 70°F 1 atm (lb/ft³)	0.1858
Specific Volume @ 70°F 1 atm (ft³/lb)	5.38
Specific Gravity	2.524
Specific Heat @ 70°F (Btu/lbmol–°F)	8.16

Deuterium

Formula	D₂
Molecular Weight (lb/mol)	4.03
Critical Temp. (°F)	–390.8
Critical Pressure (psia)	241.5
Boiling Point (°F)	–417.0
Melting Point (°F)	–426.0
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0104
Specific Volume @ 70°F 1 atm (ft³/lb)	95.97
Specific Gravity	0.142
Specific Heat @ 70°F (Btu/lbmol–°F)	6.95

Diborane

Formula	B₂H₆
Molecular Weight (lb/mol)	27.67
Critical Temp. (°F)	62.1
Critical Pressure (psia)	580.8
Boiling Point (°F)	–135.1
Melting Point (°F)	–264.8
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0712
Specific Volume @ 70°F 1 atm (ft³/lb)	14.05
Specific Gravity	0.950
Specific Heat @ 70°F (Btu/lbmol–°F)	13.67

Dichlorosilane

Formula	SiH₂Cl₂
Molecular Weight (lb/mol)	101.01
Critical Temp. (°F)	348.8
Critical Pressure (psia)	678.2
Boiling Point (°F)	49.9
Melting Point (°F)	–187.6
Psat @ 70°F (psia)	24.2
Liquid Density @ 70°F (lb/ft³)	75.19
Gas Density @ 70°F 1 atm (lb/ft³)	0.2602
Specific Volume @ 70°F 1 atm (ft³/lb)	3.84
Specific Gravity	3.470
Specific Heat @ 70°F (Btu/lbmol–°F)	14.74

Disilane

Formula	Si₂H₆
Molecular Weight (lb/mol)	62.22
Critical Temp. (°F)	303.5
Critical Pressure (psia)	746.9
Boiling Point (°F)	6.3
Melting Point (°F)	–206.7
Psat @ 70°F (psia)	49.3
Liquid Density @ 70°F (lb/ft³)	N/A
Gas Density @ 70°F 1 atm (lb/ft³)	N/A
Specific Volume @ 70°F 1 atm (ft³/lb)	N/A
Specific Gravity	N/A
Specific Heat @ 70°F (Btu/lbmol–°F)	N/A

Ethane

Formula	C₂H₆
Molecular Weight (lb/mol)	30.07
Critical Temp. (°F)	90.4
Critical Pressure (psia)	707.9
Boiling Point (°F)	–127.5
Melting Point (°F)	–297.9
Psat @ 70°F (psia)	559.6
Liquid Density @ 70°F (lb/ft³)	20.98
Gas Density @ 70°F 1 atm (lb/ft³)	0.0784
Specific Volume @ 70°F 1 atm (ft³/lb)	12.76
Specific Gravity	1.065
Specific Heat @ 70°F (Btu/lbmol–°F)	12.67

Ethyl Chloride

Formula	C₂H₅Cl
Molecular Weight (lb/mol)	64.52
Critical Temp. (°F)	369.0
Critical Pressure (psia)	764.2
Boiling Point (°F)	54.0
Melting Point (°F)	–217.0
Psat @ 70°F (psia)	20.3
Liquid Density @ 70°F (lb/ft³)	55.78
Gas Density @ 70°F 1 atm (lb/ft³)	0.1720
Specific Volume @ 70°F 1 atm (ft³/lb)	5.82
Specific Gravity	2.336
Specific Heat @ 70°F (Btu/lbmol–°F)	15.41

Ethylene

Formula	C₂H₄
Molecular Weight (lb/mol)	28.05
Critical Temp. (°F)	49.1
Critical Pressure (psia)	742.7
Boiling Point (°F)	–154.8
Melting Point (°F)	–272.5
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0730
Specific Volume @ 70°F 1 atm (ft³/lb)	13.70
Specific Gravity	0.992
Specific Heat @ 70°F (Btu/lbmol–°F)	10.28

Fluorine

Formula	F₂
Molecular Weight (lb/mol)	38.00
Critical Temp. (°F)	–199.9
Critical Pressure (psia)	754.6
Boiling Point (°F)	–306.8
Melting Point (°F)	–363.4
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0983
Specific Volume @ 70°F 1 atm (ft³/lb)	10.17
Specific Gravity	1.336
Specific Heat @ 70°F (Btu/lbmol–°F)	7.49

Halocarbon-116

Formula	C2F6
Molecular Weight (lb/mol)	138.01
Critical Temp. (°F)	67.5
Critical Pressure (psia)	432.2
Boiling Point (°F)	-108.7
Melting Point (°F)	-149.3
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft3)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft3)	0.3616
Specific Volume @ 70°F 1 atm (ft3/lb)	2.77
Specific Gravity	4.913
Specific Heat @ 70°F (Btu/lbmol-°F)	25.25

Halocarbon-23

Formula	CHF₃
Molecular Weight (lb/mol)	70.01
Critical Temp. (°F)	78.7
Critical Pressure (psia)	701.4
Boiling Point (°F)	–115.5
Melting Point (°F)	–247.3
Psat @ 70°F (psia)	626.0
Liquid Density @ 70°F (lb/ft³)	48.67
Gas Density @ 70°F 1 atm (lb/ft³)	0.1827
Specific Volume @ 70°F 1 atm (ft³/lb)	5.47
Specific Gravity	2.482
Specific Heat @ 70°F (Btu/lbmol–°F)	12.25

Helium

Formula	He
Molecular Weight (lb/mol)	4.00
Critical Temp. (°F)	–450.3
Critical Pressure (psia)	33.0
Boiling Point (°F)	–452.1
Melting Point (°F)	--
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0103
Specific Volume @ 70°F 1 atm (ft³/lb)	96.65
Specific Gravity	0.138
Specific Heat @ 70°F (Btu/lbmol–°F)	4.97

Hydrogen

Formula	H₂
Molecular Weight (lb/mol)	2.02
Critical Temp. (°F)	–400.0
Critical Pressure (psia)	187.5
Boiling Point (°F)	–423.0
Melting Point (°F)	–434.5
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0052
Specific Volume @ 70°F 1 atm (ft³/lb)	191.90
Specific Gravity	0.069
Specific Heat @ 70°F (Btu/lbmol–°F)	6.87

Hydrogen Chloride

Formula	HCl
Molecular Weight (lb/mol)	36.46
Critical Temp. (°F)	124.5
Critical Pressure (psia)	1199.2
Boiling Point (°F)	–120.8
Melting Point (°F)	–173.6
Psat @ 70°F (psia)	629.1
Liquid Density @ 70°F (lb/ft³)	51.28
Gas Density @ 70°F 1 atm (lb/ft³)	0.0948
Specific Volume @ 70°F 1 atm (ft³/lb)	10.54
Specific Gravity	1.289
Specific Heat @ 70°F (Btu/lbmol–°F)	7.29

Hydrogen Fluoride

Formula	HF
Molecular Weight (lb/mol)	20.01
Critical Temp. (°F)	370.4
Critical Pressure (psia)	940.5
Boiling Point (°F)	67.14
Melting Point (°F)	–118.4
Psat @ 70°F (psia)	15.54
Liquid Density @ 70°F (lb/ft³)	60.26
Gas Density @ 70°F 1 atm (lb/ft³)	(note 2)
Specific Volume @ 70°F 1 atm (ft³/lb)	(note 2)
Specific Gravity	(note 2)
Specific Heat @ 70°F (Btu/lbmol–°F)	(note 2)

Hydrogen Sulfide

Formula	H₂S
Molecular Weight (lb/mol)	34.08
Critical Temp. (°F)	212.8
Critical Pressure (psia)	1306.5
Boiling Point (°F)	–74.9
Melting Point (°F)	–122.0
Psat @ 70°F (psia)	263.6
Liquid Density @ 70°F (lb/ft³)	48.52
Gas Density @ 70°F 1 atm (lb/ft³)	0.0888
Specific Volume @ 70°F 1 atm (ft³/lb)	11.26
Specific Gravity	1.207
Specific Heat @ 70°F (Btu/lbmol–°F)	8.29

Krypton

Formula	Kr
Molecular Weight (lb/mol)	83.80
Critical Temp. (°F)	–82.8
Critical Pressure (psia)	798.0
Boiling Point (°F)	–244.1
Melting Point (°F)	–251.3
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.2172
Specific Volume @ 70°F 1 atm (ft³/lb)	4.60
Specific Gravity	2.951
Specific Heat @ 70°F (Btu/lbmol–°F)	4.99

Methane

Formula	CH₄
Molecular Weight (lb/mol)	16.04
Critical Temp. (°F)	–116.2
Critical Pressure (psia)	673.0
Boiling Point (°F)	–258.7
Melting Point (°F)	–296.5
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0416
Specific Volume @ 70°F 1 atm (ft³/lb)	24.06
Specific Gravity	0.565
Specific Heat @ 70°F (Btu/lbmol–°F)	8.53

Neon

Formula	Ne
Molecular Weight (lb/mol)	20.18
Critical Temp. (°F)	–379.8
Critical Pressure (psia)	384.9
Boiling Point (°F)	–410.9
Melting Point (°F)	–415.5
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0522
Specific Volume @ 70°F 1 atm (ft³/lb)	19.17
Specific Gravity	0.709
Specific Heat @ 70°F (Btu/lbmol–°F)	4.97

Nitrogen

Formula	N₂
Molecular Weight (lb/mol)	28.01
Critical Temp. (°F)	–232.5
Critical Pressure (psia)	492.3
Boiling Point (°F)	–320.5
Melting Point (°F)	–345.9
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0725
Specific Volume @ 70°F 1 atm (ft³/lb)	13.80
Specific Gravity	0.967
Specific Heat @ 70°F (Btu/lbmol–°F)	6.97

Nitrogen Trifluoride

Formula	NF₃
Molecular Weight (lb/mol)	71.00
Critical Temp. (°F)	–38.5
Critical Pressure (psia)	646.9
Boiling Point (°F)	–200.2
Melting Point (°F)	–340.2
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.1842
Specific Volume @ 70°F 1 atm (ft³/lb)	5.43
Specific Gravity	2.503
Specific Heat @ 70°F (Btu/lbmol–°F)	12.66

Nitrous Oxide

Formula	N₂O
Molecular Weight (lb/mol)	44.01
Critical Temp. (°F)	97.6
Critical Pressure (psia)	1053.3
Boiling Point (°F)	–128.3
Melting Point (°F)	–131.6
Psat @ 70°F (psia)	751.3
Liquid Density @ 70°F (lb/ft³)	48.21
Gas Density @ 70°F 1 atm (lb/ft³)	0.1145
Specific Volume @ 70°F 1 atm (ft³/lb)	8.74
Specific Gravity	1.555
Specific Heat @ 70°F (Btu/lbmol–°F)	9.17

Octafluoropropane

Formula	C₃F₈
Molecular Weight (lb/mol)	188.02
Critical Temp. (°F)	161.4
Critical Pressure (psia)	386.1
Boiling Point (°F)	–34.3
Melting Point (°F)	–233.8
Psat @ 70°F (psia)	112.8
Liquid Density @ 70°F (lb/ft³)	84.66
Gas Density @ 70°F 1 atm (lb/ft³)	0.4956
Specific Volume @ 70°F 1 atm (ft³/lb)	2.02
Specific Gravity	6.734
Specific Heat @ 70°F (Btu/lbmol–°F)	35.48

Oxygen

Formula	O₂
Molecular Weight (lb/mol)	32.00
Critical Temp. (°F)	–181.8
Critical Pressure (psia)	729.1
Boiling Point (°F)	–297.3
Melting Point (°F)	–361.9
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.0828
Specific Volume @ 70°F 1 atm (ft³/lb)	12.08
Specific Gravity	1.1
Specific Heat @ 70°F (Btu/lbmol–°F)	7.03

Phosphine

Formula	PH₃
Molecular Weight (lb/mol)	34.00
Critical Temp. (°F)	124.9
Critical Pressure (psia)	947.9
Boiling Point (°F)	–126.0
Melting Point (°F)	–208.8
Psat @ 70°F (psia)	493.2
Liquid Density @ 70°F (lb/ft³)	35.50
Gas Density @ 70°F 1 atm (lb/ft³)	0.0885
Specific Volume @ 70°F 1 atm (ft³/lb)	11.30
Specific Gravity	1.203
Specific Heat @ 70°F (Btu/lbmol–°F)	8.93

Phosphorus Pentafluoride

Formula	PF₅
Molecular Weight (lb/mol)	125.97
Critical Temp. (°F)	66.1
Critical Pressure (psia)	492.3
Boiling Point (°F)	–120.1
Melting Point (°F)	–136.8
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.3230
Specific Volume @ 70°F 1 atm (ft³/lb)	3.10
Specific Gravity	4.310
Specific Heat @ 70°F (Btu/lbmol–°F)	20.27

Propane

Formula	C₃H₈
Molecular Weight (lb/mol)	44.10
Critical Temp. (°F)	206.6
Critical Pressure (psia)	617.6
Boiling Point (°F)	–43.7
Melting Point (°F)	–305.8
Psat @ 70°F (psia)	124.9
Liquid Density @ 70°F (lb/ft³)	31.12
Gas Density @ 70°F 1 atm (lb/ft³)	0.1160
Specific Volume @ 70°F 1 atm (ft³/lb)	8.62
Specific Gravity	1.576
Specific Heat @ 70°F (Btu/lbmol–°F)	17.71

Propylene

Formula	C₃H₆
Molecular Weight (lb/mol)	42.08
Critical Temp. (°F)	197.5
Critical Pressure (psia)	666.3
Boiling Point (°F)	–53.8
Melting Point (°F)	–301.4
Psat @ 70°F (psia)	152.2
Liquid Density @ 70°F (lb/ft³)	31.92
Gas Density @ 70°F 1 atm (lb/ft³)	0.1105
Specific Volume @ 70°F 1 atm (ft³/lb)	9.05
Specific Gravity	1.501
Specific Heat @ 70°F (Btu/lbmol–°F)	15.56

Silicon Tetrachloride

Formula	SiCl₄
Molecular Weight (lb/mol)	169.90
Critical Temp. (°F)	453.0
Critical Pressure (psia)	543.8
Boiling Point (°F)	136.6
Melting Point (°F)	–94.0
Psat @ 70°F (psia)	4.0
Liquid Density @ 70°F (lb/ft³)	92.13
Gas Density @ 70°F 1 atm (lb/ft³)	(note 2)
Specific Volume @ 70°F 1 atm (ft³/lb)	(note 2)
Specific Gravity	(note 2)
Specific Heat @ 70°F (Btu/lbmol–°F)	(note 2)

Silicon Tetrafluoride

Formula	SiF₄
Molecular Weight (lb/mol)	104.08
Critical Temp. (°F)	6.5
Critical Pressure (psia)	539.3
Boiling Point (°F)	–138.6
Melting Point (°F)	–124.2
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.2711
Specific Volume @ 70°F 1 atm (ft³/lb)	3.69
Specific Gravity	3.683
Specific Heat @ 70°F (Btu/lbmol–°F)	17.50

Sulfur Dioxide

Formula	SO₂
Molecular Weight (lb/mol)	64.06
Critical Temp. (°F)	315.5
Critical Pressure (psia)	1142.0
Boiling Point (°F)	14.3
Melting Point (°F)	–103.9
Psat @ 70°F (psia)	49.3
Liquid Density @ 70°F (lb/ft³)	85.98
Gas Density @ 70°F 1 atm (lb/ft³)	0.1682
Specific Volume @ 70°F 1 atm (ft³/lb)	5.94
Specific Gravity	2.285
Specific Heat @ 70°F (Btu/lbmol–°F)	9.58

Sulfur Hexafluoride

Formula	SF₆
Molecular Weight (lb/mol)	146.05
Critical Temp. (°F)	114.0
Critical Pressure (psia)	545.2
Boiling Point (°F)	–83
Melting Point (°F)	–58.9
Psat @ 70°F (psia)	314.4
Liquid Density @ 70°F (lb/ft³)	86.25
Gas Density @ 70°F 1 atm (lb/ft³)	0.3824
Specific Volume @ 70°F 1 atm (ft³/lb)	2.61
Specific Gravity	5.196
Specific Heat @ 70°F (Btu/lbmol–°F)	22.91

Sulfur Tetrafluoride

Formula	SF₄
Molecular Weight (lb/mol)	108.06
Critical Temp. (°F)	195.6
Critical Pressure (psia)	--
Boiling Point (°F)	–40.7
Melting Point (°F)	–186
Psat @ 70°F (psia)	154.7
Liquid Density @ 70°F (lb/ft³)	--
Gas Density @ 70°F 1 atm (lb/ft³)	0.278
Specific Volume @ 70°F 1 atm (ft³/lb)	3.59
Specific Gravity	3.71
Specific Heat @ 70°F (Btu/lbmol–°F)	--

Tetrafluoromethane

Formula	CF₄
Molecular Weight (lb/mol)	88.00
Critical Temp. (°F)	–50.2
Critical Pressure (psia)	543.6
Boiling Point (°F)	–198.5
Melting Point (°F)	–298.5
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.2285
Specific Volume @ 70°F 1 atm (ft³/lb)	4.38
Specific Gravity	3.104
Specific Heat @ 70°F (Btu/lbmol–°F)	14.43

Tungsten Hexafluoride

Formula	WF₆
Molecular Weight (lb/mol)	297.84
Critical Temp. (°F)	337.7
Critical Pressure (psia)	619.3
Boiling Point (°F)	62.7
Melting Point (°F)	35.6
Psat @ 70°F (psia)	17.1
Liquid Density @ 70°F (lb/ft³)	216.13
Gas Density @ 70°F 1 atm (lb/ft³)	0.7951
Specific Volume @ 70°F 1 atm (ft³/lb)	1.26
Specific Gravity	10.803
Specific Heat @ 70°F (Btu/lbmol–°F)	28.37

Xenon

Formula	Xe
Molecular Weight (lb/mol)	131.3
Critical Temp. (°F)	61.9
Critical Pressure (psia)	847.1
Boiling Point (°F)	–162.6
Melting Point (°F)	–169.4
Psat @ 70°F (psia)	(note 1)
Liquid Density @ 70°F (lb/ft³)	(note 1)
Gas Density @ 70°F 1 atm (lb/ft³)	0.3414
Specific Volume @ 70°F 1 atm (ft³/lb)	2.93
Specific Gravity	4.639
Specific Heat @ 70°F (Btu/lbmol–°F)	5.02