[time-nuts] OT, looking for a good science forum
Scott McGrath
scmcgrath at gmail.com
Sun Jan 27 17:51:33 EST 2013
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" <jfor at quikus.com> 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" <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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