The propane in the tank remains liquid because of the pressure. As the valve opens and gas bleeds off the pressure at the top of the tank reduces allowing some of the liquid to vapourize and become gas. Only as much as the pressure will permit. This is how those colour strip tank gauges work. The point at which the propane changes from a liquid to a gas there is conversion of latent heat, the amount of energy required to change state from liquid to gas and this temperature change is reflected in the colour of the strip.
A daughter sent me an electronic out-of-propane alert device a year ago Christmas. It sticks to the side of the barbecue tank by two magnets oriented in vertical alignment on the rear of the device. I presume, because these are surrounded by a sort of rubber foam that thy include thermesters or some similar temperature sensitive devices and the circuitry sounds an alarm when they detect a difference in temperature between them, the upper warmer than the lower. You locate the alarm near the bottom of the tank and when the propane is down to that level it begins to twitter. It seems to work. If I was Han Solo I'd probably pet my wookie ----- Original Message ----- From: Lenny McHugh To: [email protected] Sent: Friday, January 15, 2010 8:58 AM Subject: Re: [BlindHandyMan] Re: Propane gas. since it boils at such a low temperature, I wonder how much pressure builds up in the 20 lb tank for a gas grill. In the hot sun the tanks do get warm. I persume that why the instructions are to turn thetank off when not in use. ----- Original Message ----- From: "Joe Plummer" <[email protected]> To: <[email protected]> Sent: Friday, January 15, 2010 8:16 AM Subject: [BlindHandyMan] Re: Propane gas. Well here in Florida a lot of people use it for heating. They also use Kerosene for heating. Sign, JP ( Joe Plummer) [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Art Rizzino Sent: Thursday, January 14, 2010 10:28 PM To: [email protected] Subject: Re: [BlindHandyMan] wireless bad thing detectors. Regarding Propane, it is often used in rural areas where Natural Gas service is not available in place of electric or oil. ----- Original Message ----- From: Dan Rossi To: [email protected] <mailto:blindhandyman%40yahoogroups.com> Sent: Wednesday, January 13, 2010 10:06 PM Subject: Re: [BlindHandyMan] wireless bad thing detectors. Bob, Very good point about the propane. I've read that as well, but forget about it, since I've never known anyone to heat with propane. I think that is because I've typically lived in cold climates. I think propane heat is more common in places where heat is not a necessity. I could be wrong there though. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: [email protected] <mailto:dr25%40andrew.cmu.edu> Tel: (412) 268-9081 [Non-text portions of this message have been removed] ------------------------------------ Send any questions regarding list management to: [email protected] To listen to the show archives go to link http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 Or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday Visit The Blind Handy Man Files Page To Review Contributions From Various List Members At The Following address: http://www.jaws-users.com/JAWS/handyman/ Visit the archives page at the following address http://www.mail-archive.com/[email protected]/ If you would like to join the JAWS Users List, then visit the following address for more information: http://www.jaws-users.com/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [email protected]! Groups Links __________ NOD32 4774 (20100115) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com [Non-text portions of this message have been removed]
