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At 07:47 PM 4/20/99 -0400, Case wrote:

>I've never heard of "viscosity" being used with anything other than
>liquids.

Any high-school physics book will describe viscosity as it
relates to both gases and liquids.

>Of course, this may be due to my extreme lack of background in
>chemistry, I dunno. At any rate, I would agree that in a rigid container
>(SCUBA cylinder), an increase in temperature would cause an increase in
>pressure (Amonton's Law.)

This is correct.

>The increase in pressure also causes an
>increase in the DENSITY of the gas.

This is not correct.

Density has dimensions of mass over unit volume.  In SI, that's
g/cm3 (grams per cubic centimeters).  In a SCUBA cylinder
with the valve closed, an increase in temperature does cause
an increase in pressure (Amonton's Law), but since the total
mass of the gas and its total volume don't change, neither
does its density.

>Is this what we're talking about, or
>is Viscosity really used with gases?

Yes... viscosity is a property of both liquids and gases.

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

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