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].
Gauge pressure, P = 2000 Pa
Density of whole blood, ρ=1.06×103kgm–3
Acceleration due to gravity, g=9.8m/s2
Height of the blood container = h
Pressure of the blood container, P=hρg
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.