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Hangzhou is the capital and most populous city of Zhejiang, People's Republic of China. It sits at the head of Hangzhou Bay, which separates Shanghai and Ningbo. Hangzhou grew to prominence as the southern terminus of the Grand Canal and has been one of the most renowned and prosperous cities in China for much of the last millennium.

Hangzhou's winter lasts from December to February, when the average temperature is usually below -5 degree Celsius. December is the driest month. The temperature drops sharply at night, by 8°C on average.

These days, under the cold of -44 degree, some people in Heilongjiang try the trick of throwing hot water into the cold air, creating a big white cloud that drifted away, with dozens of small contrails streaking toward the ground. The big cloud is condensate or water that has quickly condensed into tiny droplets, which is the same reason you can see your breath when it’s cold outside.

“Boiling water or hot water evaporates much, much more rapidly than cold water,” said Jonathan I. Katz, a professor of physics at Washington University in St. Louis. The amount of vapor “increases very rapidly as the temperature goes up.” For that reason, throwing boiling water into the air will look more impressive than throwing room-temperature water. More of it will evaporate, making a bigger cloud.

There are warnings that one must consider before trying this trick. “You never want to throw it into the wind” LA Times quoted Jeff Terry, a professor of physics at the Illinois Institute of Technology in Chicago. "A lot of people say boiling water freezes immediately, but that’s not what’s happening. It’s not instantaneous freezing of the water. If you do it carefully, you can do this without really a tremendous amount of risk to yourself. But that’s always the problem, that people don’t do things carefully", he added.

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