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A thermometer can operate without a battery by using physical principles, such as thermal expansion. In liquid-in-glass thermometers, for instance, a liquid like Mercury or colored alcohol expands and rises in a tube as temperature increases. Similarly, bimetallic strip thermometers use two different metals that expand at different rates, causing the strip to bend and indicate temperature on a scale. These designs rely solely on the properties of materials rather than electronic components.

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3w ago

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