A large commercial steel pipeline $0\mathrm{.}5$m will

be used to move the hydrogen $300km.$ The pressure of $H_2$ entering the pipeline

will be $2$MPa and will exit at $0\mathrm{.}5$MPa. The temperature throughout the line is $20$

C$.$ Find the volumetric flow rate $(\frac{m^3}{s})$ at $1$ atm and $0$C