Ebullition
When water is heated bubbles of vapor form at the bottom, rise to the cooler water above, and are condensed. As the heat continues, however, these bubbles reach the surface and escape into the air, causing the agitation called boiling or ebullition. The boiling-point of a liquid is determined by the temperature at which ebullition takes place. Water boils at 212 deg., sulphuric ether at 96 deg., alcohol at 176 deg., oil of turpentine at 316 deg., sulphuric acic at 620 deg., mercury at 662 deg.