Answers

2015-11-17T12:40:00+05:30
The substance is alcohol...and he does this to lower the temperature below 35 degrees centigrade 
and to avoid infection 
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2015-11-17T14:06:56+05:30
Doctors dip his thermometer in Alcohol solution to clean the thermometer and prevent it from spreading the infection and it's another use is to moderate the temperature of thermometer between 35 degree C.
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Hope it may help you... :)
it helped me toooo