If Keanu and Zephyr are seated on opposite ends of a seesaw and Keanu is holding a large helium balloon while inverted (doing a handstand), what happens to the balloon when he lets it go?
Provide a very brief response.
When Keanu releases the helium balloon while he is upside down, the balloon will rise upwards towards the sky, moving away from the ground and therefore away from Keanu's feet. Even though Keanu is inverted, the direction in which the balloon moves is not affected by his orientation. This is because the balloon is filled with helium, a gas that is lighter than air, which causes it to rise due to buoyancy. Gravity acts on the denser air around the balloon, pulling it downward and causing the less dense helium balloon to move in the opposite direction, toward the area of lower atmospheric pressure, which is above Keanu. The fact that he is on a seesaw does not influence the buoyant force acting on the balloon.