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].

Explanation

Let h be the height of the blood container above the vein. Then the gauge pressure at the vein will be hdg where d = density of blood.
hdg = 2000 Pa
`h=(2000)/(dg)=(2000)/(1.06xx10^(3)xx9.8)`
`=0.192=0.2m`