Why do we jerk a clinical thermometer before we measure the body temperature?

Why do we sweat ?

A clinical thermometer is not used to measure the temperatureof air, why?

A clinical thermometer is not used to measure the temperatuer of air.Why?

Doctor uses _________ thermometer to measures the human body temperature.

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Digital thermometer is widely used for the measurement of the temperature due to ________

Digital thermometer is widely used for the measurement of the temperature due to ________

Why do we wear cotton clothes in summer?