Why the humble thermometer changed our understanding of energy

The (Arguably) Most Important Instrument in Physics · 7:34 · Video: SciShow · Watch at the source

In short: Thermometers may appear basic, but they were essential to discovering one of science's most fundamental principles: the conservation of energy.

While often overlooked as a simple tool, the thermometer played a crucial role in shaping modern physics. By allowing scientists to measure temperature accurately, it provided the empirical foundation needed to grasp the concept of energy conservation.

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