Mercury in thermometers
Why is Mercury used in thermometers?
Question hasn't been forgotten...it has to do with mercury's vapor
pressure, but I'm looking for something more specific. Hang on.
Sorry...not vapor pressure. Mercury has a wide liquid state temperature
range (mp=-39 C and bp=357 C) so it is convenient to use in thermometers.
This range is adequate for lab measurements. Temps out of these ranges
usually are measured with something called a thermocouple. This converts
heat energy to electrical energy and then into a temperature.
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Update: June 2012