On Planet X, the pressure at a depth of 2.00 m below thesurface of a liquid nitrogen lake, the pressure is5.00*10^5N/m^2. At a depth 5.00 m below the surface,the pressure is 8.00*10^5N/m^2. The density if liquidnitrogen is 808 kg/m^3. What is the atmospheric pressure at the surface of the lake. The answer is 3.00 * 10^5 N/m^2, butI don't know how is was obtained.