Question

Clinical thermometers are made of glass. Identify the characteristic(s) considered for the selection of glass:
(i) It is a bad conductor of heat
(ii) It is transparent
(iii) It is malleable

• A. Only (i) and (ii)
• B. Only (ii) and (iii)
• C. Only (i) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is A

Only (i) and (ii)

Glass is a poor conductor of heat and doesn't expand easily. As a result, when the thermometer undergoes a large temperature change it will have minimal change in dimensions. Hence, we will get an accurate reading of the temperature.
Moreover, glass is transparent which helps us to see the reading of the temperature. Also, glass is not a malleable material.