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What is the phenomenon that white gas comes out when water boils? Is it endothermic or exothermic?

When water boils, white gas liquefies and gives off heat. When water boils, it will produce steam, which is a process of vaporization. Water vapor leaves boiling water and liquefies into small water droplets when it is cold, which is a visible white gas. White gas is not water vapor, water vapor is invisible and intangible, and it is not water vapor when it is seen.

Examples of liquefaction exotherm:

(1) scalded by steam at 100℃ is often much more serious than scalded by boiling water at 100℃-steam gives off a lot of heat when liquefied.

(2) Breathing by hand in winter-the water vapor in the mouth liquefies and releases heat, which changes the hand.

(3) When the kettle is used to boil water, the white gas on the mouth of the kettle-water droplets is liquefied by steam.

Extended data:

Liquefaction mode

1, two main modes of liquefaction: mode 1: lowering the temperature (all gases are at all temperatures); Method 2: Compress the volume (certain temperature of some gases).

When the temperature is low enough, any gas can be liquefied.

At a certain temperature, the volume of compressed gas can also liquefy some gases (or use both methods).

3. the method of cooling is omnipotent, and it can be liquefied if it is low enough. However, when compressing the volume, if the gas temperature is higher than its critical temperature, it cannot be compressed to liquefy it.

References:

Baidu encyclopedia-liquefaction