Re: HVAC questions

[Herbert H Gottlieb <herbgottlieb@JUNO.COM>]

This HVAC question reminds me of the debates that may
have occurred during the middle ages concerning
the number of angels that could stand on on a pinhead
at the same time. Does anyone recall the consensus
number that the majority accepted?

Herb Gottlieb from New York City
(Where the PRESSURE to raise our taxes is steadily increasing)


On Mon, 02 Dec 2002 10:17:35 -0500 Bob LaMontagne
<rlamont@POSTOFFICE.PROVIDENCE.EDU> writes:
> John Barrer wrote:
>
> > You can also (more "profitably"??) express pressure as
> > energy per unit volume; this disconnects the concept
> > from a "surface-only" phenomenon. John Barrere
> > --- cliff parker <cparker@CHARTER.NET> wrote:
>
> Two concepts of pressure have been brought up so far - energy per
> unit volume (quoted
> above) and momentum flow (John Denker).
>
> For an ideal gas, PV = 2/3 N <Ave Kinetic Energy of the individual
> molecules>.
>
> If we take the energy per unit volume approach, and then look at the
> product PV, it
> seems we have an excess of energy over the simple KE of the
> molecules. What is this
> excess energy?
>
> The momentum flow approach doesn't seem to have this difficulty.
>
> Bob at PC