[TheForge] hot air does not rise

[GHS]

Tom , you haven't seen Dave's shop. Make up air is not a problem <G>

Mike Graf

info@reciprodyne.com wrote:
> on 1/3/04 12:39 PM,
> 
>>Subject: Re: [TheForge] vent hood
> 
> 
>>The hot gasses rise, the are heavier than air when cold or at room
>>temp.  But when as hot as they are when they exit the forge they rise until
>>they cool down to room temp.
>>
>>Dave Brown
>>Heritage Smithing
>>Green Bay, WI
> 
> 
> 
> Dear Dave,
> 
> I hate to start WW-3 but: hot gasses do not rise, they must be displaced
> (via gravity) by cooler gasses in order for convection to take place. Hot
> air does not have anti-gravity properties, but is can be displaced "upwards"
> by cooler air which is denser, and therefore "heavier".
> 
> Hot-air balloons, blimps, etc, are all powered by gravity acting upon the
> cooler or denser gasses (outside the envelope) upon which these hotter or
> less dense gasses (inside the envelope) float, like a ship on water.
> 
> A closed room with a chimney must have a fresh air inlet (preferably low) in
> order for the chimney to work properly. The greater the differential in
> temp. (or density) between the flue gasses and the makeup air, the greater
> the potential draft, but with no makeup, no draft.
> 
> Tom Troszak
> 
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