On 20-2-2009 17:15, Invisible wrote:
>>> 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.


http://en.wikipedia.org/wiki/Avogadro%27s_number

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