hellium gas is added to a balloon already partially filled with helium gas.why does the balloon inflate?

Answer 1

The balloon inflates when more helium gas is added because the added helium gas particles increase the pressure inside the balloon. The helium gas particles move randomly and constantly collide with the inner walls of the balloon, exerting force on the walls. As more gas particles are added, the number of collisions with the walls and the force exerted on them increases, causing the balloon to expand. Since helium gas is lighter than air, the increased pressure inside the balloon causes it to inflate and also makes it buoyant in air.