Question

Q 3.Why is the bulb of the thermometer made of thin glass?​

Answer 1

Answer:

Glass has a very low coefficient of thermal expansion. This is the reason why thermometer bulb or for a matter of fact entire thermometer is made up of glass. Due to low coefficient of thermal expansion, when the thermometer undergoes a large temperature change it will have minimal change in dimensions.

Answer 2

Answer:

The bulb of the thermometer needs to be thin because the glass, while a good material for most of the thermometer design, is a poor conductor of heat. The mercury inside is metal and an excellent heat conductor, but the glass is an insulator. ... It is the bulb that needs to perform the best and give you a reading quickly.

hope this helps...