In hot-air ballooning a large balloon is filled with air
In hot-air ballooning, a large balloon is filled with air heated by a gas burner at the bottom. Why must the air be heated? How does the balloonist control the ascent and descent?
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selling a plant income taxes cma adapted the crossroad company is an international clothing manufacturer its santa
in hot-air ballooning a large balloon is filled with air heated by a gas burner at the bottom why must the air be
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