What outward force (in N) is needed on the outside of a lung to create the pressure P noted in the figure below, where  P = −6.00 mm Hg? Take the area affected to be 270 cm2. (This force is easily created by the diaphragm and chest muscles, as we breathe many times a day.)

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.