why does doctor tip the thermometer in a liquid before use
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It is because it is a antiseptic . The doctor checks the temperature of patients suffering from fever. It may have germs . Therfore the docter dips the thermometer in liquid before use.
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Doctor dips the thermometer in a liquid before use because It is an antiseptic solution to prevent the bacteria from the previous patient to affect the present one. After use, the doctor / nurse replaces the thermometer in that same liquid.
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