Day 91: The Galileo Thermometer wasn't invented by Galileo, despite what you may believe. He did, however, discover the principle which makes it work, i.e., that the density of a liquid changes as it heats up or cools down. Operation of the thermometer is based on the density of the liquid OUTSIDE the floating balls, which is usually ethanol or some other liquid which is more strongly affected by changes in temperature than the coloured water inside the bulbs. The weights attached to the bottoms of the balls are engraved with degrees, usually in 2-4 degree increments. Room temperature can be ascertained by reading the number on the highest ball and interpolating depending on where the second-highest is suspended. Yes, it's too warm in here. The wind is out of the north today, and that drives my heat pump crazy.
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