Why does snow feel cold when it melts?

In the process of water vapor turning into snowflakes, some heat is bound to be released. Therefore, people won't feel very cold when it snows. On the contrary, when snow begins to melt, when water changes from solid to liquid, it needs to absorb a lot of heat. According to the experimental measurement, it takes 334.4 joules of heat to melt 1 g of ice at 0℃ into water at 0℃. Therefore, when the snow melts, it needs to absorb quite a lot of heat from the surrounding air, which reduces the temperature and makes the snow feel particularly cold when it melts.

We know that when cold air comes into contact with warm and humid air, it will snow in winter. Because cold air is heavier than warm and humid air, it will lift warm and humid air to high altitude, so that the water vapor in warm and humid air will quickly condense into ice crystals and gradually increase, forming snowflakes falling. Snow melting season is cold: The snow melting season is usually sunny, and the temperature in low altitude areas begins to drop under the control of cold air pressure. Therefore, although the sun is shining, the temperature is still very low; In addition, the melting snow itself will absorb a lot of heat from the surrounding environment.

In addition, with the melting of snow, the humidity in the air increases, which reduces the warmth of clothes and makes people feel colder. Snow is not cold: first, the atmosphere needs to contain cold ice crystal nuclei; Secondly, the water is sufficient; The third is below 0℃ (freezing point). Cold air usually carries water vapor before or after snow. When water vapor turns into snow, it will release some heat, so the temperature will not drop too much, so that it will not be very cold before or in the snow. When the snow melts, usually when the weather is clear, the low altitude is controlled by cold pressure and the temperature begins to drop.

The above is Bian Xiao's detailed explanation of the problem. I hope it will help you. You can leave me a message in the comments section if you have any questions. If there is anything wrong, you can also interact with me more. If you like the author, you can also follow me. Your praise is the greatest help to me. Thank you.