Question

Which of the following statements is incorrect?

• A. Laboratory thermometers do not have a kink in them.
• B. Clinical thermometers can measure boiling point of water.
• C. The mercury expands with an increase in temperature.
• D. The range of clinical thermometers is ${35}^{\circ }C-{42}^{\circ }C$.

Answer 1

The correct option is B Clinical thermometers can measure boiling point of water.

Clinical thermometers are used to measure the temperature of the human body. Clinical thermometers have a kink in them which prevents the mercury from falling back into the bulb when the thermometer is taken out of the pateint's mouth. The range of clinical thermometers is ${35}^{\circ }C-{42}^{\circ }C$.

Mercury is used in thermometers as it expands with an increase in temperature and contracts with an decrease in temperature.