Why always blood pressure is measured in mm of Hg(mercury)?

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Solution

It's basically a matter of long established use of mercury instruments.

It's probably because of the mercury sphygmomanometer, the device that's been used for over a century to measure blood pressure. Since it actually measures pressure in terms of a column of mercury, that's how pressures are described. People still describe a "normal" blood pressure as 120/80 (mm of Hg) rather than 16k/10.6k (pascals).

Because of this you get a uniformity around the world.

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Question 116 (ii)

Health Application A doctor reports blood pressure in millimetres of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.
Manohar is a healthy 37 yr old man whose blood pressure is in the normal category.
If Manohar's systolic blood pressure is 102 mm Hg, then use the ratio from part (a) to predict his diastolic blood pressure.

Question 116 (iii)

Health Application A doctor reports blood pressure in millimetres of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.
Manohar is a healthy 37 yr old man whose blood pressure is in the normal category.
Calculate the ratio of average systolic to average diastolic blood pressures in the prehypertension category.

Why is blood pressure in human beings measured at the position shown by arrow?

Q. Air pressure is always measured in _____.

Q. A nurse measures the blood pressure of a seated patient to be

190

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