For hydrogen  ${\text{C}}_{\text{P}}{\text{-C}}_{\text{V}}\text{=m}$ and for nitrogen ${\text{C}}_{\text{P}}{\text{-C}}_{\text{V}}\text{=n}$ ,where  ${\text{C}}_{\text{P}}{\text{\hspace{0.17em}and C}}_{\text{V}}$ refer to specific heats per unit mass respectively at constant pressure and constant volume.  The relation between ‘m’ and ‘n’ is m=xn, then x is