Argon, Ar

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Argon, Ar
Categories:	Fluid; Pure Element
Material Notes:	CAS Number: 7440-37-1 Physical Form: Colorless Gas
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Physical Properties	Metric	English	Comments

Density	0.001633 g/cc	0.00005900 lb/in³	Gas

Chemical Properties	Metric	English	Comments
Atomic Mass	39.948	39.948	1995
Atomic Number	18	18
X-ray Absorption Edge	3.87068 Å	3.87068 Å	K
	43.192 Å	43.192 Å	L_I
	50.39 Å	50.39 Å	L_II
	50.803 Å	50.803 Å	L_III
Critical Temperature	-122.28 °C	-188.10 °F
Critical Molar Volume	75.0 cm³/mol	4.58 in³/mol
Ionic Radius	1.54 Å	1.54 Å	Crystal Ionic Radius for Valence +1

Thermal Properties	Metric	English	Comments
Heat of Fusion	29.54 J/g	12.71 BTU/lb
Heat of Vaporization	161.0 J/g	69.24 BTU/lb	At Boiling Point
Specific Heat Capacity	0.520 J/g-°C	0.124 BTU/lb-°F
Thermal Conductivity	0.0102 W/m-K @Pressure 0.100 MPa, Temperature -113 °C	0.0708 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -172 °F
	0.0125 W/m-K @Pressure 0.100 MPa, Temperature -73.1 °C	0.0868 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -99.7 °F
	0.0148 W/m-K @Pressure 0.100 MPa, Temperature -33.1 °C	0.103 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -27.7 °F
	0.0158 W/m-K @Pressure 0.100 MPa, Temperature -13.1 °C	0.110 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 8.33 °F
	0.0169 W/m-K @Pressure 0.100 MPa, Temperature 6.85 °C	0.117 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 44.3 °F
	0.0179 W/m-K @Pressure 0.100 MPa, Temperature 26.9 °C	0.124 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 80.3 °F
	0.0189 W/m-K @Pressure 0.100 MPa, Temperature 46.9 °C	0.131 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 116 °F
	0.0217 W/m-K @Pressure 0.100 MPa, Temperature 107 °C	0.151 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 224 °F
	0.1324 W/m-K @Pressure 0.100 MPa, Temperature -188 °C	0.9189 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -307 °F
Melting Point	-189.35 °C	-308.83 °F
Boiling Point	-185.85 °C	-302.53 °F
Heat of Formation	0.000 kJ/mol	0.000 kJ/mol	Gas

Optical Properties	Metric	English	Comments
Refractive Index	1.2312 @Temperature -188 °C, Wavelength 589 nm	1.2312 @Temperature -306 °F, Wavelength 589 nm

Component Elements Properties	Metric	English	Comments
Argon, Ar	100 %	100 %

Descriptive Properties
Appearance	Colorless Gas
CAS Number	7440-37-1
Solubility	Slightly Soluble in H₂O

References for this datasheet.

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