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The absence of weight It is a physical condition that is determined when a system moves in free fall, without external resistance.
A classic example is the case of the elevator: the weight of the human body, that is, the force exerted on the floor of the cabin would be annulled if the latter were precipitated and the occupant would have the sensation of having no weight, being in a state of imponderability .
Such a situation occurs, for example, in an spaceship that spins in orbit around the Earth. This, as is known, is subject to the force of terrestrial gravity, but also animated by a centrifugal acceleration that exactly counteracts the force of gravity, causing the body not to fall towards Earth or escape into outer space. The result of this balance is precisely what is called free fall in space around our planet. Under these circumstances, a man inside the spacecraft does not notice either the force of gravity or the centrifugal acceleration, and experiences the condition of absence of weight
A condition of zero g can also be created artificially on Earth inside an airplane in parabolic flight. This method is used to train astronauts before their space baptism.