Why can water be cooled below room temperature?

Compared with air, water is a good heat conductor. The body is exposed to the air, and the heat source is the heat generated by the human body and the radiation including sunlight. At this time, even if the temperature is lower than the body temperature, it will still feel hot if the heat conduction speed with air is not enough. When the skin is in contact with water, even if the water temperature is not much different from the air temperature, the body will obviously give off heat because of its fast heat conduction-in the brain's view, if it is in the air, this situation often happens when it is relatively cold. If the object of description is a relatively large water body, it is necessary to examine the large specific heat capacity of water. What is the specific heat capacity of water? This phenomenon can be seen from the opposite seasons between land and sea. So when the temperature rises, the water temperature will not change much for a long time. The water temperature is really lower than the temperature at this time. Will the water temperature be higher than the temperature? Of course, but because of 1, as long as the water temperature is below 36 degrees, I'm afraid we won't notice it. A glass of water, a basin of water, groundwater and a pool of water are not closed systems, so the temperature equal to the heat source cannot guarantee balance. For example, all kinds of strange things on the surface of liquid, such as evaporation, who can figure out what those unscrupulous and unsightly energy exchanges are all about ... These effects definitely have an impact on temperature in the sense of quasi-equilibrium, but I don't know how and in what order. Although I want to say this, in fact, for more water (such as a cup or a basin), this effect is far from obvious enough to lower the overall temperature. After water is left at room temperature for a long time, the temperature should be almost the same as room temperature when measured with a thermometer. The temperature you feel with your hands is different because the temperature of your hands is higher than room temperature, and water conducts heat quickly, so it looks cold. For water with large surface area and small volume, such as a wet cotton ball, evaporation will cause the temperature to be lower than room temperature, which is also the principle of dry and wet thermometer.