[TheForge] Re: fire piston

[Daniel T. Hayes]

Actually, the "T" in the Ideal Gal Law is absolute temperature (i.e. Kelvin
or Rankine). 70 Farenheit = 528.67 Rankine. Compressed adiabatically 15:1,
the air temperature would go up to 7930 Rankine or 7471 Farenheit.

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Demon Buddha
Sent: Thursday, June 08, 2006 1:01 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] Re: fire piston

nah...  if you compress air at 70*F to 1/15th its volume, the temp rises 
to 1050*.  That should be enough to ignite tinder.  I know it sounds 
odd, but the ideal gas law doesn't lie.

Freddie Warner wrote:
> You're right, Robert, the more I think of it the more I believe there 
> has to be some kind of vapor in the cylinder. You have to be able to 
> compress whatever ignites and fine wood shavings or dried grass won't do 
> that. I bet they add something like some sort of vegitable oil or 
> something that vaporizes.
> 
> 
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