What did Rømer's thermometer primarily use as a working fluid?
Alcohol
Mercury
Water
Oil
Answer
Water was the primary working fluid in Rømer's thermometer. Rømer, a Danish astronomer, invented this thermometer in 1701. It used water as the working fluid, which expanded and contracted with temperature changes. Thermometer was calibrated with two fixed points: the freezing point of water (0 degrees Rømer) and the boiling point of water (80 degrees Rømer).
Stargazing Through Time: The Ole Rømer Astronomical Challenge
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