Water is a necessity in daily life. You need it to cook. If you are thirsty, drink it. It constitutes life, and all living things cannot live without water. After work and study, people always like to drink a glass of water, both hot and cold. In the dripping weather, who has thought about whether hot water freezes first or cold water freezes first?
I have prepared two cups, one for boiling water and the other for cold water in the tap water pipe. Then, I put two glasses of water in the refrigerator and began a long wait. I also made some guesses. I guess cold water freezes first, because there is no step to cool it with hot water, so I think cold water freezes first.
The result was beyond my imagination, which surprised my teeth. Unexpectedly, hot water turned into ice first! Why on earth did I do this, so I looked it up online.
First of all, we compare the freezing methods of cold water and hot water, and we will know that the cup filled with cold water freezes for a long time, because water and glass are both bad materials for heat conduction, and the heat inside the liquid is difficult to transfer to the surface through conduction. There is water and fish, the temperature drops, the volume expands, and the density becomes smaller and smaller, so it freezes first, and then freezes around the bottom to form an ice shell. At this time, the water inside is isolated from the air and can only radiate heat, so the cooling speed is very slow.
However, the freezing method of hot water is just the opposite. Although cooling outside first will not form ice sheets, needle-like ice crystals will form inside the liquid, so the speed is faster.
In this experiment, I found that as long as you want to find something, you can find many secrets around us.