Oxygen dissolves more easily from air into water than nitrogen does. When there is the same amount of air and water, there is one molecule of O for every 2 molecules of N (a ratio of 1:2). This is different to air, where there is a 1:4 ratio of oxygen to nitrogen. It is also easier for O to dissolve in freshwater than in seawater. Oxygen condenses at 90.20 K (-182.95°C, -297.31 °F) and freezes at 54.36 K (-218.79 °C, -361.82 °F). Both liquid and solid O are see-through with a light-blue colour.