Galileo Thermometers
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The early physicist, Galileo, created the first liquid filled thermometer when he conducted tests proving that the density of a fluid is linked to its temperature. Through experimentation, Galileo found that a fluids density increases as the temperature drops and decreases as it warms up. To provide the validity of his theory, Galileo placed several liquid filled glass spheres into a fluid to record their reaction to temperature changes. As he expected, a solid body of known weight will sink as the temperature rises and float when the temperature falls.
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