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 = 1.06 x 10³ kg/m³]

Answer 1

Here, gauge pressure,

p = 2000 Pa

Density = ρ = 1.06 x 10³ kg m^-3

and g = 9.81 ms^-2

g = ρ hg,

we get h = p/ρg = {2000}/{1.06 x 10³ x 9.81}

= 0.19 m ≈ 0.2 m