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

[Scott McGrath]

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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