Hydr0gen is the lightest element in the universe! It is also the most abundant element in the universe. This post will tell you some of the physical properties of hydrogen. For more information on hydrogen see the links at the bottom of the post.
Physical Properties of Hydrogen
- Atomic Weight: 1.00794 g/mol
- Colorless, tasteless, odorless and extremely flammable.
- State at Room Temperature: Gas
- Density (at standard temperature and pressure): 0.08988 g/L
- Melting Point/Freezing Point: 14.01K, -259.14C, -434.45F
- Triple Point: 13.8033K (-259C) and 7.042 KPa pressure. The triple point is the temperature and pressure where all three phases (solid, liquid and gas) of an element coexist.
- Enthalpy of Fusion: 0.117 kJ/mol (this is for the element H2- halve for just one atom of hydrogen)
- Enthalpy of Vaporisation: 0.904 kJ/mol (for H2)
- Specific Heat Capacity (at 25C): 28.836 J/molK.
- Boiling Point: 20.28K, -252.87C, -423.17F
- Automatic Ignition Temperature: 773K, 500C, 932F
- Flash Point (theoretical only- not observed): 20K, -253C, -423F
- Very poor conductor of electricity
- Enthalpy of Atomization (at 25C): 217.6 kJ/mol
Thanks to Environmental Chemistry for some of this information!