Hydrogen, H 2

Login to see your most recently viewed materials here. Or if you don't have an account with us yet, then click here to register.

Hydrogen, H₂
Categories:	Fluid; Pure Element
Material Notes:	Physical Form: Colorless Gas; Flammable
Key Words:	H2
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
Printer friendly version Download as PDF Download to Excel (requires Excel and Windows) Export data to your CAD/FEA program Add to Folder:

Physical Properties	Metric	English	Comments

Density	0.0000820 g/cc	0.00000296 lb/in³	Gas
Molecular Weight	2.016 g/mol	2.016 g/mol	H₂
Vapor Pressure	0.1000 bar @Temperature -258.6 °C	75.00 torr @Temperature -433.5 °F

Chemical Properties	Metric	English	Comments
Atomic Mass	1.007825	1.007825	¹H
	1.00794	1.00794	Natural Abundance - 1995
	2.014102	2.014102	²H (Deuterium, D)
	3.016049	3.016049	³H (Tritium, T)
Atomic Number	1	1
Critical Pressure	12.93 bar	9698 torr
Critical Temperature	-240.18 °C	-400.32 °F
Critical Density	0.0310 g/cc	0.00112 lb/in³
Critical Molar Volume	65.0 cm³/mol	3.97 in³/mol
Electronegativity	2.2	2.2	Pauling
Ionic Radius	1.54 Å	1.54 Å	Crystal Ionic Radius for Valence -1

Electrical Properties	Metric	English	Comments
Dielectric Constant	1.228 @Temperature -253 °C	1.228 @Temperature -423 °F	20.4 K

Thermal Properties	Metric	English	Comments
Heat of Fusion	59.5 J/g	25.6 BTU/lb	Enthalpy of fusion at normal melting point
Heat of Vaporization	446.4 J/g	192.0 BTU/lb	Enthalpy of vaporization at normal boiling temperature
Specific Heat Capacity	14.29 J/g-°C	3.414 BTU/lb-°F	Gas
Thermal Conductivity	0.0686 W/m-K @Pressure 0.000 MPa, Temperature -173 °C	0.476 BTU-in/hr-ft²-°F @Pressure 0.000 psi, Temperature -280 °F	gas; low pressure limiting value
	0.1869 W/m-K @Pressure 0.000 MPa, Temperature 26.9 °C	1.297 BTU-in/hr-ft²-°F @Pressure 0.000 psi, Temperature 80.3 °F	gas; low pressure limiting value
	0.2304 W/m-K @Pressure 0.000 MPa, Temperature 127 °C	1.599 BTU-in/hr-ft²-°F @Pressure 0.000 psi, Temperature 260 °F	gas; low pressure limiting value
Melting Point	-259.34 °C	-434.81 °F	At atmospheric pressure (760 torr)
Boiling Point	-252.87 °C	-423.17 °F
Heat of Formation	0.000 kJ/mol	0.000 kJ/mol	Gas

Optical Properties	Metric	English	Comments
Refractive Index	1.1096 @Temperature -253 °C	1.1096 @Temperature -423 °F	Liquid

Component Elements Properties	Metric	English	Comments
Hydrogen, H	100 %	100 %

Descriptive Properties
CAS Number	1333-74-0
Solubility	Slightly Soluble in H₂O

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

Users viewing this material also viewed the following:
Nitrogen, N₂
Oxygen (O₂)
Sodium Chloride, NaCl (Halite)
Helium, He
Argon, Ar

AMEH0 / 41

Free Trade Publications, Click Here!

	Advertise with MatWeb!
	Data sheets for over 180,000 metals, plastics, ceramics, and composites.
	HOME • SEARCH • TOOLS • SUPPLIERS • FOLDERS • ABOUT US • FAQ • LOG IN

System Message