On Wed, 30 May 2012 13:02:53 -0700, mike wrote:

Do the math on boiling temperature. You've just converted your
inability to measure temperature into an inability to measure
atmospheric pressure.

Boiling Points of Water at Various Elevations
http://www.engineeringtoolbox.com/boiling-points-water-altitude-d_1344.html

Roughly a 1C drop in the boiling point for a 1000ft gain in altitude.
No need to measure atmospheric pressure. You can read your altitude
from a topo map, compensate for the boiling point, and still be quite
accurate at calibrating the thermometer. The effects of atmospheric
pressure are negligible:
http://wiki.answers.com/Q/How_does_the_elevation_and_air_pressure_affect_the _boiling_point_of_water
Unless there's a hurricane coming, the typical changes in atmospheric
pressure might change the boiling point over a +/-1C range.


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Jeff Liebermann
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