I think you missed my reply where iPhone helpfully corrected acetylene to acetone I do know the difference
Sent from my iPhone On Jan 27, 2013, at 12:21 PM, "J. Forster" <[email protected]> wrote: > Nope. Acetone is a solvent you can buy at Home Depot or CVS (as nail > polish remver). > > Liquid Acetylene has to be kept dissolved in Acetone at pressure. > > -John > > =================== > > >> Liquid acetone requires special handling and pressurized cells to keep it >> from explosively disassociating. Ammonia also requires pressure vessels >> and in pure form is incredibly corrosive >> >> So unless you are trained in these techniques just don't even think about >> doing this >> >> Sent from my iPhone >> >> On Jan 26, 2013, at 3:57 PM, "J. Forster" <[email protected]> wrote: >> >>> You can't be serious. Ammonia gas or liquid is dangerous. >>> >>> You can buy calibrated RTDs or rent a quartz thermometer and stay alive. >>> >>> YMMV, >>> >>> -John >>> >>> =============== >>> >>> >>>> Hi >>>> >>>> If the intent is to come up with a triple point cell to calibrate your >>>> thermometer, acetone's triple point (at 178.5K) is a bit low. I still >>>> think I'd go with ammonia. >>>> >>>> Bob >>>> >>>> On Jan 26, 2013, at 2:51 PM, Graham / KE9H <[email protected]> >>>> wrote: >>>> >>>>> On 1/26/2013 1:29 PM, Paul Amaranth wrote: >>>>>>> Message: 4 >>>>>>> Date: Sat, 26 Jan 2013 16:28:19 +0100 >>>>>>> From: Fabio Eboli <[email protected]> >>>>>>> To: Discussion of precise time and frequency measurement >>>>>>> <[email protected]> >>>>>>> Subject: Re: [time-nuts] OT, looking for a good science forum >>>>>>> Message-ID: <[email protected]> >>>>>>> Content-Type: text/plain; charset=UTF-8; format=flowed >>>>>>> >>>>>>> Il 2013-01-26 14:58 Bob Camp ha scritto: >>>>>>>> Hi >>>>>>>> >>>>>>>> Platinum RTD's are a pretty good bet for -80C, they hold up well >>>>>>>> down >>>>>>>> there. For calibration, ammonia and acetylene both have triple >>>>>>>> points >>>>>>>> in the vicinity. I'd probably try ammonia first, but not for any >>>>>>>> good >>>>>>> Doesn't acetylene have a bad habit of dissociate when pure liquid? >>>>>>> >>>>>>> Fabio. >>>>>> Yes, it's normally stored disolved in acetone. It also spontaneously >>>>>> dissociates >>>>>> if pressures exceed 15 psig or 30 psi absolute. That could put a >>>>>> real >>>>>> damper on your day. >>>>> Just pure acetone works well at dry ice temperatures. We used crushed >>>>> dry ice >>>>> in acetone as an alternative when the liquid nitrogen truck was late >>>>> making its delivery >>>>> for the cryro lab. >>>>> >>>>> --- Graham / KE9H >>>>> >>>>> == >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
