Chen and Aarav are in a room with a helium-filled balloon tied to a string, which Chen is holding. Chen releases the string. What happens to the balloon when Chen releases it, and what can Aarav, who is standing on the opposite side of the room, observe about the balloon's movement? Provide a very brief response.
When Chen releases the string, the helium-filled balloon will rise toward the ceiling because helium is lighter than air and provides the balloon with buoyancy. Aarav, observing from the opposite side of the room, will see the balloon ascending away from Chen's hand and toward the ceiling until it may come to rest against the ceiling or be stopped by another object in its path. The balloon will move vertically upward from Chen's perspective and diagonally upward from Aarav's perspective.