CASE1: A container with some water is open to atmosphere, pressure is definitely atmospheric, no somehow I put cover over it and sealed it also. Pressure would increase because new equilibrium will establish between water and its vapour so pressure will increase in the closed container. CASE2: There is an empty container that means only air, now I cover it. Pressure will not increase; but my doubt is; as atmospheric pressure is defined as the weight of atmosphere over it divided by the surface area. As I close the container the weight is acting on the cover that load will be taken by the whole container so how the particles inside the container will feel the atmospheric pressure? Cover is not a fluid that means no pascals law; so how pressure reaches inside the container?