(2) The higher the temperature of water, the more heat will be lost to the surrounding environment in the same time. If the temperature is raised at the same time, the water needs to absorb more heat and the heating time will be longer. Therefore, it takes less time to heat a certain quality of water from 20℃ to 30℃ than from 85℃ to 95℃ with the same alcohol lamp.
(3) As can be seen from the image shown in Figure 2, the change of water temperature with time before boiling is characterized by a rapid increase and then a slow decrease, while the change of water temperature with time after boiling is characterized by a constant temperature, and the change of water temperature with time during natural cooling is characterized by a rapid decrease and then a slow decrease.
So the answer is: (1)14.0; (2) less than; The higher the water temperature is than the room temperature, the more heat the water loses. (3) The temperature rises rapidly first and then slowly; The temperature is constant; The temperature drops rapidly at first, and then slowly.