Stresses, Pressure, Velocity and Basic laws

Hydrostatic Pressure

EXAMPLE $1-1$

Express a pressure of $2\mathrm{.}5{10}^{5}Pa(\frac{N}{m^2})$ in terms of $mmHg.$

Specific gravity of $Hg=13\mathrm{.}6.$ and $g=9\mathrm{.}807(\frac{m}{s^2})$

SOLUTION

Sp$.$gravity $=\frac{{}_{H_g}}{{}_{H_{2}O}}=13\mathrm{.}6$

Siquid $,$ gravity $=\frac{\text{D}\text{e}\text{n}\text{s}\text{i}\text{t}\text{y}of}{\text{D}\text{e}\text{n}\text{s}\text{i}\text{t}\text{y}of\text{w}\text{a}\text{t}\text{e}\text{r}}$

${}_{H_{2}O}=1000\frac{kg}{m^3}$

${}_{Hg}=13\mathrm{.}61000=13600\frac{kg}{m^3}$

Using hydrostatic equation $P=.g.h$