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A gas-filled balloon moves up. Is the upward force acting on the balloon larger or smaller than the force of gravity?
A gas-filled balloon moves up. Is the upward force acting on the balloon greater or smaller than the force of gravity?
Solution:
Obviously, the upward force acting on the balloon is greater than the force of gravity. So the gas-filled balloon rises. The density of the gas in the gas-filled balloon is less than that of air. So the buoyant upward force that is greater than the force of gravity pushes the balloon upwards and the balloon rises up in the air. Air is a fluid. Liquids and gases are fluids. In fluids, the Archimedes principle works according to which denser objects sink while lighter objects float in fluids.
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