The Science Behind Helium-filled Balloons

Why does a balloon filled with helium experience greater buoyant force compared to a similar balloon filled with cold air?

Choose the correct statement:

A. Helium is denser than air

B. Helium is lighter than air

C. Cold air is denser than helium

Answer:

The correct answer is: B. Helium is lighter than air

When a balloon is filled with helium, it experiences greater buoyant force compared to a similar balloon filled with cold air due to the difference in density between helium and air. Helium is a lighter gas than the surrounding air, which means it has a lower density.

As a result, the helium-filled balloon weighs less than the air it displaces, leading to a net upward force or buoyant force. This buoyant force is stronger than the force acting on the cold air-filled balloon since the density of cold air is closer to that of the surrounding air.

Therefore, the helium-filled balloon can float or rise more effectively in the air than the balloon filled with cold air. This phenomenon showcases the importance of understanding density and buoyant force in objects immersed in fluids.