Boil it

Boiling is the action by which a liquid changes into a vapour. Let’s assume we have a pan of water on the hob and bring it to the boil. This means it can go no hotter without turning into steam and evaporating. The surface bubbles furiously as the water particles change into steam. Water boils at 100 degrees but different liquids have different boiling (evaporation) points. You should put a lid on a pan when boiling as it takes less time and uses less energy to do it. A pan with a lid on will boil roughly twice as fast as one without. An example of boiling rapidly to allow liquid to evaporate is in the Red wine jus for steak.