Zephyr and Makena are sitting in a room with a single window. Zephyr is directly facing the window, and Makena is sitting with her back to it. They are both watching a balloon filled with helium that is tied to a chair in the center of the room. If the string were to suddenly break, what would Zephyr and Makena each see in relation to what happens to the balloon?

Provide a very brief response.
When the string breaks, the helium balloon would rise toward the ceiling because helium is less dense than air, causing the balloon to be buoyant. Zephyr, facing the window, would see the balloon move upward and probably slightly away from them towards the ceiling. Depending on the height of the ceiling and balloon's position related to Zephyr's line of sight, Zephyr might lose sight of the balloon if it goes above the window frame. Makena, with her back to the window, would also see the balloon rise upwards, but since she is facing the opposite direction, she would not be at risk of losing sight of the balloon behind the window frame; she would see it until it reaches the ceiling or any other obstacle in the upward direction of the room.