The correct answer is C. principle of buoyancy.
Buoyancy is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. All objects experience two forces when they are in a fluid: gravity and buoyancy. Gravity pulls the object down, while buoyancy pushes the object up. If the object is more dense than the fluid, then gravity will be stronger than buoyancy and the object will sink. If the object is less dense than the fluid, then buoyancy will be stronger than gravity and the object will float.
A balloon is less dense than air, so it floats. The air inside the balloon is also less dense than the air outside the balloon, so the balloon is pushed up by the air pressure. This upward force is called buoyancy.
The law of gravitation states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This means that the Earth’s gravity pulls on the balloon, and the balloon’s gravity pulls on the Earth. However, the Earth is much more massive than the balloon, so the Earth’s gravity is much stronger. This is why the balloon falls to the ground when you let go of it.
Archimedes principle states that the upward buoyant force exerted by a fluid that is in static equilibrium on a partially or fully immersed object is equal to the weight of the fluid that the object displaces. This means that the balloon will float if the weight of the air that it displaces is greater than the
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