I like this a lot, although a smaller image in a *.png might have preserved the
caustics better, but nice.

The Gallilean (sp?) themometer work on density changes of the bulk fluid verses
the fludis in the bulbs. As the temperature rises, the density of a liquid
ideally is reduced. So, as the temperature rise the density of all the liquids
in the thermometer goes down (bulk liquid as well as each bulb), but what is
important is that the rate of change, dp/dT  (p = rho = density g*ml^-1), is
different for each liquid. I forget what the composition of each liquid is (each
bulb has a slightly different composition), but that is how they work.


-paul
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Paul Daniel Jones
120 Chandlee Laboratory
Penn State University
814-865-2090
pdj### [at] psuedu

http://research.chem.psu.edu/glassgrp/paul
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