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"A Galilean
thermometer,
or thermoscope is a thermometer made of a sealed glass cylinder containing
a clear liquid. Suspended in the liquid are a number of weights. Commonly
those weights are themselves sealed glass containers with coloured
liquid for an attractive effect. As the liquid changes temperature
it changes density and the suspended weights rise and fall to stay
at the position where their density is equal to that of the surrounding
liquid. If the weights differ by a very small amount and are ordered
such that the least dense is at the top and most dense at the bottom,
they can form a temperature scale."
Wikipedia |
Close-up
of a Galilean thermometer.