When an object is immersed in water, the weight corresponding to the same volume of water as the volume used becomes lighter.
This is called "buoyancy".
The boat gets on the water and gets lighter.
Therefore, less energy is required to operate.
Airplanes do not have the benefit of "buoyancy."
In other words, energy is required to move the weight of the airplane up and forward.
For airplanes, the weight of fuel is added to the weight of the aircraft.
That is, fuel is needed to carry the fuel.
"Flying shame" can also be proved by Archimedes' principle.
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