why we can't use laboratory thermometer to measuring human body temperature

A laboratory thermometer cannot be used to measure the temperature of a human body because the range of a laboratory thermometer is high generally from –10°C to 110°C, while as normal body temperature in humans is only 37°C. Also laboratory thermometer does not have a kink, so mercury falls on its own which does not give accurate temperature of the human body. 

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 because it does not have a kink .

kink prevents mercury from falling on its own.

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