Jamar is standing in a large open field on a sunny day, holding a helium-filled balloon on a string. He wonders what will happen if he lets go of the string. What happens to the balloon when Jamar releases the string, and why?
Make your response very short.
When Jamar releases the string, the balloon rises upwards into the sky. This happens because the helium inside the balloon is less dense than the surrounding air, which makes the balloon buoyant. The force of buoyancy, resulting from the pressure difference between the bottom and the top of the balloon, pushes it upwards into the sky, overcoming the force of gravity that is pulling it down.