Re: Amalgam in a vacuum
From: Jan (jdrew63929_at_aol.com)
Date: 11/17/04
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Date: 17 Nov 2004 21:17:29 GMT
>Subject: Re: Amalgam in a vacuum
>From: clintonz@prodigy.net (Clinton C Zimmerman)
>Date: 11/17/2004 10:30 AM Pacific Standard Time
>Message-id: <a4025728.0411171030.6b02460@posting.google.com>
>
>jdrew63929@aol.com (Jan) wrote in message
>news:<20041117001827.16116.00000797@mb-m02.aol.com>...
>> >Subject: Re: Amalgam in a vacuum
>> >> >??? maybe so but not for that reason. And what does a vacuum have to do
>> with
>> >> >it?
>> >>
>> >> It's a diversion, which YOU started. (feel free to correct me you didn't
>> first
>> >> mention it))
>> >
>> >Not me, IIRC
>> >
>> >carabelli
>>
>> Didn't ask you what you remembered.
>>
>> Can you answer. Was it you??
>>
>> Jan
>
>It was me. I cannot lie.
Thank you, one of the few here, that makes three of us, IIRC.
You, me and Steve Bornfeld.
Jan
>
> Dr. Steve was caught up on the idea that erosion from salvia
>or chemical emission only causes Hg emission, and there can be complex
>suface interactions with oxygen so I moved the amalgam to a vacuum to
>get around that distraction.
>
>There were other statements made implying that people thought an
>amalgam base in a crown couldn't give off mercury if it were sealed or
>if there
>were no air.
>
>Note that Carabelli states the vapor pressure will be higher, but to
>have more pressure you need more Hg atoms to come out of the amalgam
>which is supposedly inert.
>
>PV=nrt.
>(Pressure times volume equals the number of atoms in the volume times
>the temperature of the atoms times a constant)
>
> That shows that Hg atoms leave amalgam for only one reason.
>Because they can. A vacuum merely exaggerates physical properties
>already
>inherent in a substance. Water boils in a vacuum, but at a lower
>temperature because the surface molecules always want to leave the
>surface
>and now they can more easily. That behavior in water or amalgam (which
>is
>actually behaving like a liquid)_might not be as intuitively obvious
>at the same temperature outside the vacuum.
>
>
>
>
>
>
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