A balloon filed with helium rises in air because:
Helium pushes down on the air below the balloon | |
Air exerts an upward force on the balloon | |
The balloon is weightless | |
Helium is less dense than air |
Helium pushes down on the air below the balloon | |
Air exerts an upward force on the balloon | |
The balloon is weightless | |
Helium is less dense than air |