Two thermos flasks are of the same height and same capacity

cbse
thermal-properties

#1

Two thermos flasks are of the same height and same capacity. One has a circular cross-section while the other has a square cross-section. Which of the two is better?


#2

Sol. As both flasks have same height and capacity, the area of the cylindrical wall will be less than that of the square wall. Hence, the thermos flask of circular cross-section will transmit less heat as compared to the thermos flask of square cross-section and will be better.