Question

What will happen to its weight if it is blown?

Answer 1

Hint : Buoyancy force makes objects float. It is the force applied to an object that is partially or entirely immersed in a fluid. Buoyancy is affected by the variations in pressure acting on opposing sides of an object submerged in an immobile fluid. It is also named as buoyant force.

Complete step-by-step solution:
When a balloon is without air, then its weight acts in a downward direction.
$W = mg$;

When a balloon is filled with air; then its weight acts in the downward direction and also a buoyant force acts in the upward direction.
The force of buoyancy depends on the volume of the body immersed, equal to the volume of fluid displaced and the fluid's density.
Buoyant force, $F_{b} = \rho V g$
Weight, $W = mg$
m is the mass of a balloon.
g is acceleration due to gravity.
Then net force on the blown balloon, $W’ = W - \rho V g$
$\rho$ : density
V: volume
$\implies W > W’$
When a balloon is blown, then its effective weight is less and feels lighter. It will be lighter when it is blown.

Note: When submerged in water or any fluid, the body feels a force from the downward direction in opposition to the gravitational pull direction, responsible for the drop in its weight. However, we recognize that some objects, such as a plastic bottle, swim over water.