A normal blood pressure reading is less than 120/80 where both numbers are gauge pressures measured...
A normal blood pressure reading is less than 120/80 where both numbers are gauge pressures measured in millimeters 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?
Homework Answers
Solution:
Density of mercury = d = 13.56 x 10^3 kg/m^3
Gravity = g = 9.8 m/s/s
Height of the column of mercury = h = 0.12 m
a) Absolute pressure = density x gravity x height + Atmospheric pressure .
= 13.56 x 10^3 * 9.8 * 0.12 + (101,325)
= 15946.56 +101325
= 11,271.56 Pa
b) Gauge pressure = 13.56 x 10^3 x 9.8 x 0.12
= 15946.56 Pa
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