A liquid remains hot or cold for a long time inside a thermos flask because heat loss or gain is prevented by which process?

Which of the following represents a relation for 'heat lost = heat gained'?

In which of the following, heat loss is primarily not due to convection?

In an earthen pitcher, the water remains cold due to the process of

Which of the following is not a type of thermodynamic process?

A fan produces a feeling of comfort during the hot weather because