A thin test-tube partially filled with water is placed vertically with its open end to the atmosphere. Due to diffusion in the tube, a linear change in vapor concentration is established with height so that near the water surface the vapor is saturated while at the upper open
end of the tube the vapor has a concentration of 2 times less. Then the tube is hermetically sealed from the atmosphere with a lid. How much will the pressure of humid air inside the tube change relative to the atmospheric pressure after the equilibrium is established? The atmospheric pressure is 760 mmHg. The experiment is conducted at temperature 320 K. The pressure of saturated vapor at this temperature is 80 mmHg. Give your answer in mmHg and round it to the whole.