Question

In a thermos flask, there is vaccum between two glass tubes. What is the importance of vaccum from the following? :

(a) Neither conduction nor convection occurs

(b) Conduction and convection occurs

(c) Transffering heat to the outer parts

(d) To reflect heat

Please guys I need this desperately...

Answer 1

option a is the correct ans

Answer 2

ANSWER:

The correct option is a) Neither conduction nor convection occurs.

EXPLANATION:

    Whenever thermos flasks are manufactured, a layer of vacuum is created between 2 glass tubes. The function of this vacuum is to prevent conduction and convection.

   By preventing conduction and convection, the thermos flask can keep the state of the contents inside as it is, if the content is cold, it is kept cold and if the content is hot it is kept hot.