2. When it is usually 1 atmospheric pressure, the boiling point of water is 100 degrees Celsius. After the water is boiled, it will continue to boil as long as the temperature is maintained by a small fire. Until the zongzi is cooked. If the fire continues to burn after the water is boiled, the excess heat will not raise the water temperature, but only make a part of the water get enough heat to turn into steam and boil into the air. 1 g 100℃ water will be converted into 1 g 100℃ water vapor by absorbing 539 calories, which is called the latent heat of water. Therefore, the fire continued to burn vigorously, but the water was burned into steam and evaporated, wasting the fire.