Kiran and Chi are standing at the bottom of a hill wearing balloons tied to their wrists with strings. Kiran's balloon is filled with helium, and Chi's balloon is filled with air. A gust of wind blows across the hill. What happens to the balloons and how do Kiran and Chi perceive the pressure of the wind?
Provide a short response.
Kiran's helium balloon will rise and pull against the string on their wrist as the lighter-than-air helium causes the balloon to float upward. The pressure of the wind will push against the surface of Kiran's balloon, causing it to move in the direction of the wind. Kiran will feel a tugging sensation on their wrist as the balloon is caught by the wind and pulled sideways, along with the upward pressure of the helium.

Chi's air-filled balloon will not rise like Kiran's because the density of the air inside the balloon is similar to the surrounding atmosphere. Instead, Chi will feel the direct pressure of the wind against the surface of the balloon as it pushes against their wrist. The balloon will be pressed down and sideways in the direction the wind is blowing but will not tug upwards as Kiran's does. Chi will primarily feel the force of the wind against the side of the balloon facing the wind, resulting in pressure on their wrist in the direction the wind is blowing.