home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.autos.tech
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!mlb.semi.harris.com!billy.mlb.semi.harris.com!jws
- From: jws@billy.mlb.semi.harris.com (James W. Swonger)
- Subject: Re: A/C manifold gauges question
- References: <1992Sep9.195545.4121@newsgate.sps.mot.com> <1992Sep9.230529.19206@gtephx.UUCP> <1992Sep10.162339.23464@news.nd.edu>
- Date: Thu, 10 Sep 1992 17:59:23 GMT
- Nntp-Posting-Host: billy.mlb.semi.harris.com
- Organization: Harris Semiconductor, Melbourne FL
- Sender: news@mlb.semi.harris.com
- Message-ID: <1992Sep10.175923.21093@mlb.semi.harris.com>
- Lines: 25
-
- In article <1992Sep10.162339.23464@news.nd.edu> mikeb@nowaksg.chem.nd.edu (Michael George Buening) writes:
- >In article <1992Sep9.230529.19206@gtephx.UUCP> rakoczynskij@gtephx.UUCP (Jurek Rakoczynski) writes:
- >>example, the pressure in a propane tank will read the same at a given
- >>temperature no matter how much propane is actually in the tank.
- >
- >Whoa!!! What is the logic behind this statement. I'm not sure what
- >you mean here but I can't make sense of this. As many of you know from
- >a simple chem/phys text: PV=nRT
- >where P=pressure; V=volume; n=amount of the gas (in moles); T=temp
- >and R= gas constant. When you change any one of the variables,
- >n,T or V, you change P. If you have more propane in a tank at the
- >same temp you will have more pressure. Because this is related to
- >n, or the amount of propane, you can correlate pressure with concentration
- >if you know what the volume is.
- >
- This is the Ideal Gas Law. Heavy molecules are far from ideal. Propane
- liquifies under sufficient pressure (the vapor pressure at a given
- temperature). If you have any liquid in the tank the pressure -will be-
- the vapor pressure (at equilibrium) by definition. Any additional propane
- will be liquid, not gas.
- --
- ##########################################################################
- #Irresponsible rantings of the author alone. Any resemblance to persons #
- #living or dead then yer bummin. May cause drowsiness. Alcohol may inten-#
- #sify this effect. Pay no attention to the man behind the curtain. Billy!#
-