Unlocking the Mystery of Hot-Air Balloons

Why does a hot-air balloon rise?

1. The weight of the balloon is less than the weight of the air displaced by the balloon.

2. The weight of the air displaced by the balloon is less than the volume of the balloon.

3. The volume of the air displaced by the balloon is less than the volume of the balloon.

Final Answer:

A hot-air balloon rises because the hot air inside the balloon is less dense than the surrounding cool air. This creates a buoyant force that causes the balloon to rise.

Hot-air balloons have fascinated people for centuries with their ability to gracefully float through the sky. But have you ever wondered why a hot-air balloon rises?

The final answer to this intriguing question lies in the density of the air inside the balloon compared to the surrounding air. When the air inside the balloon is heated, it becomes less dense than the cooler air outside. This density difference creates a buoyant force that is greater than the weight of the balloon, allowing it to rise.

As the hot air inside the balloon expands and becomes less dense, it displaces a certain amount of cooler, denser air. This displacement of air creates a lift force that propels the balloon upwards. The volume of the hot air inside the balloon must be carefully controlled to ensure that it remains less dense than the surrounding air, maintaining the buoyant force needed for flight.

In summary, the hot air inside the balloon is the key to its upward movement. The collision of molecules, the increase in pressure, and the resulting buoyant force all work together to lift the balloon skyward, creating a magical experience for all who witness it.