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A person has a length of 1.35 m between the heart and the feet. Estimate the amount by which the blood pressure P2 in the feet exceeds the blood...

The pressure can be calculated by using the following equation:


`P = rhogH`


where P is the pressure, `rho` is the density of the fluid, g is acceleration due to gravity and H is the head difference.


When a person is lying down, there is no vertical separation between the heart and the feet and hence the value of H is 0. Thus, the blood pressure difference between the feet and heart would be 0 and both heart and feet will have the same blood pressure.


When the person is standing upright, there is a vertical separation of 1.35 m between the heart and the feet. The blood pressure difference can be calculated by using the above equation and the density of blood as 1,060 kg/m^3.


Pressure difference = 1060 kg / m^3 x 9.8 m/s^2 x 1.35 m


= 14,023.8 Pa or 14.02 kPa.


Hope this helps.

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