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].

Solution

## 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 ∴h=Pρg=20001.06×103×9.8=0.1925m 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.   PhysicsNCERT TextbookStandard XI

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