Vapor pressure and solution concentration

It can be known from ural's law that at a certain temperature, the vapor pressure of a component above the solution is directly proportional to the amount and concentration of the substance in the solution, and is directly proportional to its saturated vapor pressure when it is a pure component. However, there is a deviation between the actual solution and Ural solution. Most solutions have a positive deviation and a few solutions have a negative deviation. Liquid air can be regarded as a binary solution of oxygen and nitrogen, which is a solution with positive deviation, but the deviation is small. Liquid air can be regarded as an ideal solution.