When you have a fever, the temperature is taken with the
help of a thermometer. The bulb of the thermometer is normally placed under the
tongue or in the armpit or groin. What's the reason? For a correct reading of
body temperature, the bulb of the thermometer (which contains mercury) has to
be in direct contact with the body's surface. If the thermometer is placed simply
inside the mouth, it may not give a correct reading, as the bulb may not be in
contact with the tongue. In such a case the temperature recorded will be that
of the air and saliva in the mouth.
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