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Question -

During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein? [Use the density of whole blood from Table 10.1].



Answer -

Gauge pressure,┬аP┬а= 2000 Pa

Density of whole blood,┬а╧Б┬а= 1.06 ├Ч 103┬аkgmтАУ3

Acceleration due to gravity, g = 9.8 m/s2

Height of the blood container =┬аh

Pressure of the blood container,┬аP┬а=┬аh╧Бg

The blood may enter the vein if the blood container is kept at a height greater than 0.1925 m, i.e., about 0.2 m.

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