>> Ah, here we go: H2 is "0.08988 g/L". Apparently air itself is heavier 
>> than that.
>>
>> (You would, of course, *expect* air to be heavier than the lightest 
>> gas in the universe. But not thousands of times heavier...)
> 
> Only seems like a factor of 10 difference to me.  You do realise that 
> 1g/L is 1kg/m^3...

Heh. I hadn't noticed that the mass unit was different as well as the 
volume unit. ;-)

Even so, 10x higher still seems rather large. I would have expected 
something more like a few percent denser.

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