in a laboratory thermometer why should the bulb be dipped in the liquid for which the temperature is measured?
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Bulb thermometers rely on the simple principle that a liquid changes its volume relative to its temperature. ... All bulb thermometers use a fairly large bulb and a narrow tube to accentuate the change in volume.
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This is because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in its tube will start falling quickly. This will give a wrong value of the body temperature.
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