I believe it is levitation you mean by levity.
The gravity is the acceleration to centre of planet while levitation is the force act against and nullify gravitation. Levitation may come by many form such as magnetic force or suspension in gas or liquid stream. Floating in water is considered a levitation by buoyancy force.
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Gravity is the force that pulls objects towards each other, such as the force that keeps us grounded on Earth. Levity, on the other hand, refers to a lightness or humor in attitude or behavior. Gravity is a physical force, while levity is a more abstract concept related to mood or demeanor.
Sir Isaac Newton is credited with developing the law of gravitation, also known as Newton's law of universal gravitation, because he was the first to mathematically formulate and describe the force of gravity as a universal force of attraction between objects with mass. Through his work, he provided a fundamental explanation for the motion of celestial bodies and laid the foundation for classical mechanics.
It is called gravity.
Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter.
When a planet is far away from the sun, the pull of gravity between them will decrease. This is because gravity weakens with distance, following the inverse square law. The gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.
Difference between collenchyma and chlorenchyma