The (Arguably) Most Important Instrument in Physics
Thermometers might seem like a basic instrument, but science would not be the same without them, and they helped us understand one of the most important ideas in all of science: the conservation of energy. Crash Course – History of Science:
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https://royalsocietypublishing.org/doi/abs/10.1098/rstl.1804.0009 Images: https://en.wikipedia.org/wiki/File:Joule_James_sitting.jpg