Ebullition or boiling is the violent agitation produced in a liquid when it is heated from a liquid to a gaseous condition. The heat acts first on that portion of the liquid resting against the heated surface, and converts a part of it into steam, which rises in the form of bubbles that break on the surface of the liquid. The temperature at which a liquid boils is called its boiling point. Each liquid has its specific boiling point as well as its specific weight at a specific atmospheric pressure. The boiling point remains constant during ebullition.