Your friend says that the buoyant force of the atmosphere on an elephant is significantly greater than the buoyant force of the atmosphere on a small helium-filled balloon. What do you say?
Buoyant force is equal to weight of the displaced fluid by the object volume.assume elephant is bigger than balloon,the buoyant force on the elephant is bigger than the buoyant force on the balloon.hence my freind says right thing. Or Helium is right that the buoyant force of the atmosphere on an elephant is much greater than on a smaller-helium filled balloon,because the buoyant force equals the weight of air that is displaced,which is much larger for elephant due to its much larger volume. hence my freind says right thing.