If the molecules of air are added continuously to the inflatable bag of the car then the pressure of the molecule will decrease as given by Boyle's law.
Boyle's law is a gas law that establishes the relation between the volume and the pressure of the gas. It states the inverse correlation between the two factors respective to the constant temperature.
Boyle's law is given as:
P₁V₁ = P₂V₂
Where an increase in the volume will decrease the pressure of the gas. So, if the air molecules are added to the bag then the pressure inside will reduce.
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