Blood pressure is normally taken on the upper arm at the level of the heart. Suppose, however, that a patient has his arms in a cast, so you cannot take his blood pressure in the usual way. If you have him stand up and take the blood pressure at his calf, which is 89.5 cm below his heart, what would be the magnitude Δ? of the difference between this measurement of blood pressure and a normal blood-pressure measurement? The density of blood is 1060 kg/m3. Δ?= mmHg Is the blood pressure measured at the calf larger or smaller than the blood pressure measured at the upper arm?
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Blood pressure is normally taken on the upper arm at the level of the heart. Suppose, however, that a patient has his arms in a cast, so you cannot take his blood pressure in the usual way.
If you have him stand up and take the blood pressure at his calf, which is 89.5 cm below his heart, what would be the magnitude Δ? of the difference between this measurement of blood pressure and a normal blood-pressure measurement? The density of blood is 1060 kg/m3.
Δ?=
mmHg
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