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At 08:29 PM 4/25/99 -0400, Case wrote:

>But yet, in another post, regarding the same topic, you state that:
>
>> What heating a gas does is decrease its *density* not its
>> viscosity which is a different animal altogether.
>
>So...which is it? Unless I'm missing something here, you appear to have
>contradicted yourself.

Above, I meant a non-contained gas.  If you put the gas in
a balloon and heat it, the balloon expands, decreasing the
density of the gas because the molecules are farther apart.
Density is mass divided by volume.  When the balloon expands,
it still weighs the same, but now it's volume is bigger.
The number of grams of gas divided by the now-larger
volumes (g/cm3) means that the density decreased.

If you put the same gas in a SCUBA cylinder and heat it,
the mass hasn't changed (the gas still weighs the same when
you heat the SCUBA cylinder) and it's volume hasn't changed
either (the cylinder is still the same size), it follows
that the density hasn't changed either.

-Mike Rodriguez
<mikey@ma*.co*>

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