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The crystal on everyone's clothes is actually a cream. Frost is a phenomenon of desublimation that occurs when water vapor (ie, gaseous water) is present at very low temperatures. It is similar to snow. In the cold winter morning, frost on the branches and leaves of outdoor plants usually occurs because the night plants heat slowly, the temperature of the surface is extremely low, the water vapor radiates unpleasantly, and they freeze when they gather on the surface of the plants, thus forming a frost. 
Similarly, on the day when the temperature of the Dongling Mountain peak was lower than the freezing point, the moisture in the body of the mountaineering partner and the air circulated through the respiratory tract became cold and defrosted on the surface of the clothes. The formation of frost is not only related to the above-mentioned weather conditions, but also to the attributes of the ground objects. Frost is formed on the surface of a radiation-cooled object, so the easier the surface of the object is to radiate heat and quickly cool, the easier it is to form frost on it.
From this, it can be determined that the temperature of Dongling Mountain on the day was extremely low, and everyone’s mountaineering consumed a great deal. In such severe weather conditions, they still managed to reach the summit. We should give praise to the team leader Xiao Hu and all the other partners.
When the donkey from Dongling Mountain returned, he shared a group of photos. They welcomed the first snow this winter and excitedly covered their faces. Observe carefully that their clothes hats are covered with small white ice crystals. Truth as Su Shi's wonderful words "even if they meet together, they don't know, dust, and frost." What kind of power dress up this group of Santa Claus? Here's a trekking Jun to science.