In Reply to: I'm not sure your assertion is correct posted by Charles Hansen on April 14, 2007 at 18:29:51:
<< Cryogenics substantively changes material properties, and domestic deep freezing involves temporary expansion and contraction. They are significantly different. >>< Why do you say this?
I suspect he said it becuase it is established scientific fact.
>If your assertion were true, there must be some "threshold" temperature that "changes material properties" beyond just a "temporary expansion and contraction". So what would you propose as this threshold temperature?Yes there are threshold tempuratures. If you want to know what they are I suggest you consult a genuine metallurgist or some literature on the subject.
>And a few more questions:
- Would the threshold temperature be the same for all materials?
I don't need to consult any metallurgist for this one. No.
>- Would the duration of exposure below the threshold temperature matter?That would be a question for an expert.
>- Would the rate of re-heating to room temperature matter?I can answer this one. Soemtimes yes sometimes no.
>I would assert that things are perhaps not so black-and-white as "cryogenics" versus "domestic deep freezing"...I would assert that this stuff has already been investigated by people who actually know how to inverstigate these things.
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Follow Ups
- Ignorance is fuel for such nonsense. - Analog Scott 11:36:01 04/15/07 (1)
- Re: "I would assert this stuff's already been investigated by people who actually know how to inverstigate them." - geoffkait 12:04:26 04/15/07 (0)