Parabolic flight is also used to perform scientific experiments.
Flight consists in this operative mission:
The aircraft (A300 Airbus) reaches an altitude and keeps a horizontal flight, it starts to climb and noses up to 45° in the first part of parabola, then it executes the down side of the parabola to return to its steady horizontal flight; now the manoeuvre is concluded and the aircraft can start another parabola.

During the parabolic flight, about 25 seconds, in the aircraft there is a zero-g condition, due to an apparent force that balances gravity. During these 25 seconds it’s possible to make experiments.
Every flight consists in a great number of parabolas with an interval of two minutes between two of them.