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Hot Air Balloons by kaevictor on 01-20-2014
Steve and Stacy are planning to ride a hot air balloon this weekend with their kids. Suddenly, a question pop out of Steve's mind.
Do you know why hot air balloon rise?
Yes. As you know, a hot air balloon rises because the air inside the balloon is hotter than the air outside the balloon. This difference in density allows the balloon to float upwards.
Oh I see. I think it is somehow related in fluid mechanics ideas. the forces acting on the balloon, we realize a buoyancy force is pushing upwards on the balloon, while the drag force and the weight of the balloon and the air it contains acts downwards
Exactly. This change in density also affects the magnitude of the drag and buoyant forces, which in turn affects the velocity at which the balloon rises
I think our children would be more excited to know about this knowledge.
That's true. Come on and let's go back to work.
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