ESL / EFL Quiz 189

Thermometers are used to measure the temperature of the human body, at home, clinics and hospitals. When performing this procedure, hold your hand less than 1 inch from the stopper to avoid exerting torque on the thermometer. Thermometers can be calibrated either by comparing them with other calibrated thermometers or by checking them against known fixed points on the temperature scale. The best known of these fixed points are the melting and boiling points of pure water.