Question

Convert normal blood pressure readings of 120 over 80 mm Hg to newtons per meter squared using the relationship for pressure due to the weight of a fluid (P=phg) rarher than a conversion factor

Answer 1

The deinsity of mercury is

$$\rho=13600\frac{kg}{m^3}$$

$$P_1=\rho g h_1=(13600)(9.8)(0.12)=16000\frac{N}{m^2}$$

$$P_2=\rho g h_2=(13600)(9.8)(0.08)=10700\frac{N}{m^2}$$

The normal blood pressure lies between these two values.