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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A normal blood pressure reading is less than 120/80 where both numbers are gauge pressures measured in milli-meters of mercury (mmHg). What are the (a) absolute and (b) gauge pressures in pascals at the base of a 0.120 m column of mercury ?

(a)

To determine
The absolute pressure in Pascal at the base of a 0.120 m column of mercury.

Explanation

Given info: A normal blood pressure reading is less than 120/80 are gauge pressures measured in millimetres of mercury.

The formula for the absolute pressure in Pascal at the base of a column of mercury is,

P=P0+ρgh

  • P0 is atmospheric pressure.
  • ρ is density of blood.
  • g is acceleration due to gravity.
  • h is height of the mercury column.

Substitute 101.3×103Pa for P0 , 13.6×103kg/m3 for ρ , 9.80m/s2 for g , and 0.120m for h to find P

(b)

To determine
The gauge pressure in Pascal at the base of a 0.120 m column of mercury.

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