Question

CH Assuming that an adult has a blood volume of 4.8 dm? What is the weight of the blood? (take g = 9.8 m/s2 and whole blood density: 1060 kg/mº) O

Answer 1

We have,

Approximate blood volume in an adult =

( note that,

dm = decimeter

$1\:dm=0.1\:m=10\:cm$

1 dm 10 m n3 = 103 cm = 1 ltr

So,

V = 4.8 dm = 4.8 x 10 m

We have

Whole blood density $=\rho=1060\:kg/m^{3}$

So total mass of blood in an adult will be given as,

$m=\rho.V$ ___________________relation(1)

So weight of the blood will be given as,

$W=m.g$

$g=9.8\:m/s^{2}=$ acceleration due to gravity of earth near the surface of the earth.

Using relation (1) in above relation we get,

$W=\rho.V.g$

Using given values of $\rho,V\:and\:g$ we get,

$W=1060\times4.8\times10^{-3}\times9.8$

$W=49.8624\:N$

So weight of the blood in an adult is,

$W=50\:N$ (Expressed in two significant figures)