[time-nuts] temperature sensor

Chris Albertson albertson.chris at gmail.com
Mon Jul 21 22:57:24 EDT 2014

On Mon, Jul 21, 2014 at 5:54 PM, Bill Dailey <docdailey at gmail.com> wrote:
> You don't use ice as a reference.  With ice water, the same principles apply that apply to boiling water.  This is why these are convenient calibration check points.
>>> How much does the measured temperature vary between just barely boiling and a
>>> good roiling boil?  Or in various locations within a pot of boiling water?

It is very uniform temperature, that is after is gets to really
boiling.    Certainly NONE of the water is over 100C or as soon as it
gets over it phase changes and released a lot of heat.   I think it is
just because of water's high heat of vaporization that the temperature
is uniform, kind of a feedback loop.

Ice water tends to be at the melting point of ice but it lacks the
automatic feedback at the micro scale that boiling has.  It depends on
the conductivity of water and we all know there can be gradient and
even that water can reach below 0C and remain liquid.


Chris Albertson
Redondo Beach, California

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