For each drop$-$down box, select the appropriate word from the drop$-$down that best completes the sentence.

The air molecules within the balloon Blank $1$ Question $9$Exert inward pressureExert outward pressureStay stillCollapse the balloon by colliding with its inner surface, while external air molecules collide with the outer surface, exerting a pressure that could lead to the balloon's collapse.$$Blank $2$ Question $9$Inward and outward pressures in balanceTension in the rubberCollisions with outer surfaceHeat from external sources makes the balloon remain inflated. If you add more air to the balloon, the increased collisions result in momentary higher internal pressure, causing the balloon to expand until a balance is restored. Heating the balloon accelerates gas molecules, intensifying collisions and temporarily Blank $3$ Question $9$Increases inside pressureDecreases inside pressureCauses no impact on the balloon's sizeCauses the balloon to collapse $.$ As the balloon expands, internal pressure decreases, returning the balloon to pressure equilibrium. Cooling the balloon leads toBlank $4$ Question $9$Outside pressure exceeds inside pressureInside pressure increaseOutside pressure decreaseNo impact on the balloon's size $.$