Basic knowledge of Midea air conditioner repair; What is condensation. Article source: Beijing Midea Air Conditioner Repair Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3760772. The process by which a substance changes from a gaseous state to a liquid state is called condensation, or liquefaction. For example, water vapor condenses into water droplets when it comes into contact with a cooler object. Water vapor is relatively easy to liquefy, but some gases require lower temperatures and higher pressures to achieve liquefaction, Midea air conditioner repair in Beijing. The liquefaction of air is similar; air must be compressed and cooled below -196°C in order for it to become liquid.