Michael Pronay > wrote in
:

> "Tom S" > wrote:
>
>> Nitrogen is _lighter_ than air (but not by much).
>
> I thought air was a mixture of roughly 80% nitrogen with 20%
> oxigen. How can one be ligther than the other?
>
> M.
>

Nitrogen is the llighter component of air (lighter than the oxygen) this is
so the same as water is lighter than alcohol even though they mix.