"Pouring water to make ice" makes the winter atmosphere full, be careful not to get hurt

The recent cold wave sweeping across the country has made "pouring water to turn it into ice" popular in this northern winter.

Source: Xinhuanet

The principle of "pouring water to turn into ice" is that hot water will evaporate into water vapor in the cold air, and when the water droplets are small, they will easily freeze quickly. The "pouring water to turn into ice" that you see is actually water mist freezing into ice.

"Pouring water to make ice" is a good teaching experiment and also an interesting game, but you must pay attention to safety to avoid hurting others or yourself.

The old man got his head scalded when water was poured on him

Recently, an old man on the Internet became a hot topic because he messed up the "water-to-ice" challenge. In the video, he took a large bowl, filled it with hot water, and started the challenge by getting into a horse stance.

Unexpectedly, the old man threw the bowl away at the moment of splashing water, and the boiling water poured down on his head, scalding his forehead. Reporters found that there are many cases of people being scalded because the temperature is not low enough and they blindly follow the trend.

Prerequisites for water to become ice

Can water really freeze instantly? In this regard, @中国天气官微 once popularized the basic condition for water droplets to freeze instantly when the temperature reaches below -40℃.

Source: Xinhuanet

Under these conditions, two physical changes occur when water drops become ice. First, when water drops freeze under low temperature conditions, their volume increases and latent heat is released. Water drops release latent heat from the outside to the inside, with the outer layer of the water drop freezing first and gradually freezing inward.

The lower the temperature, the faster the water droplets freeze; under the same temperature conditions, the smaller the water droplets, the easier it is to freeze solid. When the temperature is above -40℃, it is difficult to make ice by pouring water in the air, but it is still very easy to make ice by pouring water on the ground.

Hou Zhaoyang, a professor at the Department of Applied Physics, School of Science, Chang'an University, said that the phenomenon of water turning into ice requires dry and cold temperature conditions. There is no exact value for the temperature, but it must be above -20℃.

Technical tips for turning water into ice

Source: Xinhuanet

Netizens from all over the country have also summed up some experience in practice, such as: if the temperature is not low enough, the water temperature must be high, the water droplets splashed must be fine, and how to exert force when splashing water.

However, when you are doing the action of pouring water to make ice, please be careful: you can use hot water when pouring water, and try to pour it diagonally upwards, don't use boiling water! Avoid "getting wet" and avoid getting burned!

In addition, there is a little trick for taking photos. You can shoot against the light, and choose the shooting time in the morning or afternoon when the sun is relatively low; the recommended exposure speed is one thousandth of a second, and use continuous shooting.

Finally, a warm reminder: when playing the game of splashing water to make ice, be careful not to splash the hot water on yourself, let alone the photographer!

Comprehensive sources: Xinhuanet, China Weather, Beijing Evening News, Jingbao, Xiaoxiang Morning News, etc.