The pressure of a moist gas at $27^{\circ} \mathrm{C}$ is $4 \mathrm{~atm}$. The volume of the container is doubled at the same temperature. The new pressure of the moist gas is ________________ $\times 10^{-1} \mathrm{~atm}$. (Nearest integer)

(Given : The vapour pressure of water at $27^{\circ} \mathrm{C}$ is $0.4 \mathrm{~atm} .$ )