$2\mathrm{.}22.$ The Prandtl number, $N_{Pr},$ is a dimensionless group important in heat transfer calculations. It is

defined as $C_p\frac{}{k},$ where $C_p$ is the heat capacity of a fluid, $$ is the fluid viscosity, and $k$ is the

thermal conductivity. For a particular fluid, $C_p=0\mathrm{.}583\frac{J}{g*C},k=0\mathrm{.}286\frac{W}{m*C},$ and $=$

$1936l\frac{b_m}{ft*h}.$ Estimate the value of $N_{Pr}$ without using a calculator $($remember$,$ it is dimension$-$

less$),$ showing your calculations; then determine it with a calculator.