Answers

2015-06-26T17:52:22+05:30
As mercuty is the only liquid at room temperature and as well as good conductor of heat. It is kept in thermometer so as a minimum change of temperature is notable to detect weather the person is ill or not.
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2015-06-26T18:24:57+05:30
We keep mercury in thermometer because it is a good conductor of heat as it expands on heating which helps us to know about the temperature. 
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