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During exhalation, the diaphragm muscle contracts, exerting a force of 530 N over an area of 610 cm^2.
How much pressure does this create?
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Pressure = Force/Area

= 530/(610*10^-4)

= 8688.524 Pa

As

760mm of Hg = 1 atm = 101325 Pa

Therefore

8688.524 Pa = (760/101325)*8688.524

= 65.169 mm of Hg
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