Boyle’s law states that pressure multiplied by volume is a constant value. Hence which of the following statements is correct? A. The amount of air in the lungs will increase when the pressure inside them increases. B. A positive pressure is produced in the lungs when the chest expands C. A negative pressure is produced in the lungs when the chest expands. D. The amount of air in the lungs will decrease when the pressure in them decreases.
Option C. Boyle’s states: P × V = constant. This method that as one of P or V will increase, the opposite decreases sufficient for their product to be unchanged. Hence as V will increase with chest expansion, P decreases to below atmospheric pressure (a negative pressure).
