Galileo thermometers
Galileo thermometer is a thermometer made from mercury, which placed in a glass tube. Signs are calibrated on the tube make the temperature can be read according to the length of the mercury in the glass, varies according to temperature. To improve accuracy, there is usually a water bulb mercury at the tip of the thermometer which contains most of the mercury; expansion and narrowing of the volume of mercury and then proceed to the tube more narrow. The space between the mercury can be filled or left empty.
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