在烹饪锅中煮沸水，气泡纹理特写，竖屏视频。

water with air bubbles texture in cooking pot closeup view video. Boiling or ebullition is the rapid phase transition from liquid to gas or vapour; the reverse of boiling is condensation. Boiling occurs when a liquid is heated to its boiling point, so that the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere. Boiling and evaporation are the two main forms of liquid vapourization. Boiling water is used as a method of making it potable by killing microbes and viruses that may be present.