Date: Wed, 02 Feb 2005 04:03:56 GMT From: "James Sweet" <jamessweetnospamail.com> Subject: Re: Saab newbie
"MH" <nomailnospamere.no> wrote in message news:ctolr9$fhb$1nospam1.zwoll1.ov.home.nl... > > ...propane tank builders > > had just been using to heat tar. The lower half of the tank was > > frosty, neatly marking the part still containing liquid gas. > > Because the liquid gas (under high pressure) is expanding to near > atmospheric pressure and drawing heat from its surroundings, cooling it down > to -0C, freezing the moisture in the air. Same things happens in > carburetors, and LPG evaporators, these sometimes freeze up. > The gas boils, turns from liquid phase to gas phase, like boiling water. > Boiling needs heat. > Propane torches and for that matter any sort of compressed tank will do the same, some to a greater extent than others, it's the exact same process as refrigeration and AC systems use except it's not a closed cycle. You could charge your A/C with propane and it would work, though I would certainly not recommend it as a leak could be dissastrous.