# physics

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The SYSTOLIC pressure in a major artery is measured at 115 mmHg. What is the net force on a 1 cm2 section of the artery wall if the absolute pressure in the tissue outside the arterial wall is 108.6 kPa?

• physics -

115 mm = 15.332 kPa
see
https://www.convertunits.com/from/mmHg/to/pascal
1 atm is about 101.3 kPa
101.3 + 15.3 = 116.6 kPa absolute
so difference in presuure across wall
= 116.6 - 108.6 = 8 kPa = 8000 Pascals or Newtons / m^2
1 cm^2 = 10^-4 m^4
so our force is
8000 * 10^-4 = 0.8 Newtons

• physics -

Thank you so much.

• physics -

You are welcome.

• physics -

excuse me, why did you add atm pressure to 15.3? your answer is true 100 present, but I did not understand this point.

• physics -

Yes I did because the meters used measure relative, not absolute, pressure. (Relative is above one atmosphere)

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