Boiling is the rapid vaporisation (change of state from liquid to gas) of a liquid to a gas. This occurs usually when a liquid is heated to its boiling point. This happens when the temperature of the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere. 


Boiling water: image: wikipedia/Markus Schweiss 

There are two main types of boiling:

  •  nucleate boiling where small bubbles of vapour form at discrete points, and 
  • critical heat flux boiling where the boiling surface is heated above a certain critical temperature and a film of vapor forms on the surface. 

Transition boiling is an intermediate, unstable form of boiling with elements of both types. The boiling point of water is 100 °C or 212 °F but is lower with the decreased atmospheric pressure found at higher altitudes.\

Source adapted from: Wikipedia contributors. (2020, May 17). Boiling. In Wikipedia, The Free Encyclopedia. Retrieved 00:35, July 28, 2020, from