On this Wikipedia the language links are at the top of the page across from the article title. There are two main types of boiling: nucleate boiled mussels recipe 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. Boiling water is used as a method of making it potable by killing microbes and viruses that may be present. Boiling water is also used in several cooking methods including boiling, steaming, and poaching.