I’ve always understood that hydrogen was the lightest element on the periodic table. However last night when I was watching the television show The Universe, I could have swore they said a statement that was something like “methane is lighter and more dense than hydrogen”. And they went on to elaborate how NASA was looking into using it as an alternative fuel instead of hydrogen gas to fuel space shuttles.
Does something happen to the chemical composition of methane when it becomes liquid that causes it to become lighter but more dense than it’s counterpart liquid hydrogen?
I don’t have TIVO so I couldn’t backup and listen to the statement again.
Could someone possibly clarify what they meant?
