   Chapter 9, Problem 8P

Chapter
Section
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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