Most of the adventurous water molecules get knocked back into the liquid, so that practically whole of the added heat energy is retained as increased molecule speed in the liquid. As the addition of heat proceeds we reach a point where the upward bombardment by jumping molecules overcomes the downward bombardment of the overlying air or vapour molecules.
Marami sa mga molekyul ng tubig ay kusang napapabalik sa likido. Dahil dito, ang kabuuan ng dagdag na enerhiya ng init ay napapanatili habang bumibilis ang paggalaw ng mga molekyul ng likido.