How Thermometer is Made

The How Thermometer is Made for 2025

Learn about how a Thermometer is Made. The operating principle of a thermometer is fairly simple: a known measure of liquid is vacuum-sealed in a glass tube. Liquids expand or contract when heated or cooled by air. The bulb reservoir is made by heating one end of the glass tube and pinching it closed. Digital thermometers contain a little […]

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