What is the restoring force in propagation of air particles?

Answer: Restoring force is a force that act on a particle away from equilibrium to bring it to equilibrium position in a physical system.

If the particle is preturbed away from equilibrium, the restoring force will bring the particle back to equilibrium position.

Restoring force function only on position mass or particles and bring them to equilibrium.

Explanation:

Restoring force is a force that act on a particle to bring it to equilibrium position. The restoring force of the air particles should be displaced in the way of the force i. e it should be in direction of it.

Restoring force is a force which acts to bring a body to its equilibrium position. The restoring force is a function only of position of the mass or particle, and it is always directed back toward the equilibrium position. Therefore the restoring force of air particles should be displaced in the direction of the force and according to Newton 3rd law of motion, once the force is removed, restoring force of elasticity returns the displaced particle to a resting state.