Question

Describe the construction of a thermo flask with the help of a neat diagram and label it.

Answer 1

Construction of thermo flask:

1. Thermo flask contains a double-walled glass bottle. The thin layer between the metal bottle and wall is evacuated.
2. This evacuated sealed together along their neck at the bottle.
3. The wall is done as silver lining. It is important to conserve heat. It prevents heat loss through radiation.
4. The silvered surface reflects the heat, thus reducing the heat exchange due to radiation.
5. This causes the liquid in a thermo flask to stay hot or cold for a longer period.