How to measure temperature of a liquid without a thermometer?
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the doctors need to know your inner body heat. Only some parts of the body show the same temperature as the real heat inside your body: Your tongue, ear, armpits etc. Hence tongue is used as it is considerably convenient.
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A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. ... As temperatures rise, the mercury-filled bulb expands into the capillary tube. Its rate of expansion is calibrated on the glass scale.
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