A thermoscope is an early scientific instrument used to measure temperature changes. It is often considered a precursor to the more well-known thermometer. Developed in the early 1600s, the thermoscope typically consists of a glass tube filled with air or liquid that expands or contracts in response to temperature changes, causing a visible movement of the liquid. The device works on the principle of thermal expansion: as the temperature increases, the air or liquid inside the tube expands, causing it to rise in the tube.
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