Wanting to weigh the air, they inflated a rubber ball and weighed it. Then they released air

| February 28, 2021 | education

Wanting to weigh the air, they inflated a rubber ball and weighed it. Then they released air from the balloon and weighed it again. The weight in both cases turned out to be the same. From this it was concluded that air weighs nothing. What is the mistake of the experimenters? A) the air must be weighed in a vessel with a constant shape B) the weighing must be done in a vacuum C) the air must be weighed at a very low temperature D) the air must be weighed at a very high temperature

Two forces act on the balloon: the force of gravity m * g, directed vertically downward, and the buoyancy force of Archimedes Farch, directed vertically upward. The weight of the ball P will be determined by the formula: P = m * g – Farch.
The buoyancy force of Archimedes is determined by the formula: Farch = ρ * g * V. Where ρ is the density of the gas in which the body is immersed, g is the acceleration of gravity, V is the volume of the immersed part of the body in gas.
The mass of air in the ball is determined by the formula m = ρ * V.
Farch = ρ * g * V = m * g.
The force of gravity is compensated by the force of Archimedes.
In order to remove the buoyancy force of Archimedes, it is necessary that the density of the gas ρ around the ball filled with air be equal to 0.
Answer: weighing must have been carried out in a vacuum.



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