Will an empty balloon have precisely the same apparent weight on a scale as a balloon filled with air? Explain.
No, the mass of the air-filled balloon is more than the empty balloon. The density of the empty balloon is more than the air-filled balloon.
From the Archimedes principle, the outside air has been displaced as the weight of the inside air is higher than the buoyant force on the balloon. Due to this, the weight of the balloon is more than the outside air weight.
The weight of the inflated balloon is always higher than the deflated balloon. Also, the density of the deflated balloon is higher than the inflated balloon.
The pressure inside the inflated balloon is higher than the outside pressure. The density of the air inside the balloon is also more than the outer air.
So, the apparent weight of the inflated balloon is more than the empty balloon.
Thus, the empty balloon will not have the same apparent weight on a scale as a balloon filled with air.
Why does an ocean liner float?
(a) It is made of steel, which floats.
(b) It's very big size changes the way water supports it.
(c) It is held up in the water by large Styrofoam compartments.
(d) The average density of the ocean liner is less than that of seawater.
(e) Remember the Titanic—ocean liners do not float.
Hot air is less dense than cold air. Could a hot-air balloon be flown on the Moon, where there is no atmosphere?
(a) No, there is no cold air to displace, so no buoyancy force would exist.
(b) Yes, warm air always rises, especially in a weak gravitational field like that of the Moon.
(c) Yes, but the balloon would have to be filled with helium instead of hot air.
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