We can obtain different gases from air by fractional distillation of liquid air.
Air is a fully homogeneous gaseous mixture. It is composed of various gases such as nitrogen, oxygen, carbon dioxide, argon, and others in various quantities. Since it’s a homogeneous mixture, we need to use special separation techniques. Fractional distillation is a technique for extracting different components from the air.
To obtain liquid air, the air is compressed by increasing the pressure and then cooled by lowering the temperature. This liquid air is able to slowly warm up In a fractional distillation column, where gases are separated at various heights based on their boiling points.