What is the principle of freezing flowers instantly when blowing bubbles at minus 30 degrees in the northeast?

The principle of freezing flowers instantly when you blow bubbles at minus 30 degrees in the Northeast is that when the outside temperature is much lower than the melting point of soapy water, when the soap bubbles come into contact with the ice surface with a relatively high water vapor content, the water vapor quickly condenses. Ice crystals form and release heat, causing the bottom of the bubble to be warmer and the top to be colder.

In this case, the temperature difference within the bubble will cause "updrafts" to appear, causing the "small ice crystals" initially formed at the bottom of the bubble to be sent to the middle and upper parts of the bubble, and further condense and grow, creating snowflakes. ball effect. ?

It is reported that the lowest temperature in Songling District, Daxinganling, Heilongjiang recently dropped to more than 30 degrees below zero. Mr. Hu, a photography enthusiast, used a straw and foam water to blow bubbles outdoors, and frozen ice flowers instantly formed. It attracted the attention of netizens. Mr. Hu said: This scene has extremely high temperature requirements, and dreamy ice bubbles can only be blown out at about minus 30 degrees Celsius.

Extended information:

Examples of actual phenomena of sublimation:

1. A light bulb that has been used for a long time will change from transparent to black because it generates heat when it is working. , and the tungsten vapor formed by the heated sublimation of the tungsten wire condenses into an extremely thin layer of solid tungsten on the wall of the light bulb.

2. On winter nights, the indoor water vapor often condenses into ice crystals on the window glass; the "rime" on the branches; the popsicles taken out from the refrigerator form a layer of "frost"; and For example, the formation of "frost" in nature, the window grilles on windows, etc. are all phenomena of condensation.

3. When the iodine vapor is cooled, iodine particles will appear on the inner wall of the flask.

4. The white edges that appear on the leaves in winter.