Suppose there is a test chamber containing liquid nitrogen. The container is insulated and only a small opening is there so that chamber is exposed to atmospheric condition. As the saturation temperature of liquid nitrogen is -196 degree Celsius at 1 atm pressure. chamber will remain at -196 till depletion of liquid nitrogen. Now my question is; somehow that opening to the chamber is closed. What will happen to the temperature and pressure of the chamber? I can answer the question if the chamber is not insulated. The chamber will attain the room temperature. But I cannot guess about phenomenon occurring inside. What will be the phase and so on? So please explain in both the cases; insulated and non insulated chamber when chamber is closed after being exposed to atmosphere.