[time-nuts] OT, looking for a good science forum

J. Forster jfor at quikus.com
Sun Jan 27 12:21:19 EST 2013


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" <jfor at quikus.com> 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 <timenut at austin.rr.com>
>>> 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 <FabioEb at quipo.it>
>>>>>> To: Discussion of precise time and frequency measurement
>>>>>>    <time-nuts at febo.com>
>>>>>> Subject: Re: [time-nuts] OT, looking for a good science forum
>>>>>> Message-ID: <5ef3f142b075fcab38182666a4e5073b at quipo.it>
>>>>>> 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
>>>>
>>>> ==
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>




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