"Andy Durbin" wrote in message
om...
snip
That seems to say that the volume of copper is *very* small so its
mass would be too. Is there any useful heat exchange between a
negligible mass of copper and .45 litres of air?

I'll add the knowledge to my useful pub tricks list though.

Andy

Rather than squeeze this out a piece at a time, take a look at:
http://www.betsybyars.com/guy/soarin.../69-vario.html

and get a perhaps-useful overview.

Tim Ward