Question

Why thermometer is washed with cold water before using it??

Answer 1

If there is expansion of temperature in the thermometer, then if we measure the temperature of anyone's body it may give wrong or more temperature. So, the thermometer is washed with cold water before using it, such that the mercury can come in the kink and give the right temperature of body.

Answer 2

To maintain and reduce the temperature of mercury of the thermometer till zero and to prevent infections