English: Yamdrok Lake, Tibet Autonomous Region.

The water surface on the earth's surface and various types of atmospheric underlying surfaces (such as soil, forests, grasslands, buildings, etc.) and various types of water-containing objects contain a large amount of liquid water. The liquid water is on the surface of various substances and is vaporized at any time. , that is, from liquid to gas. During the conversion process, the liquid water absorbs the heat of the environment (ie, the latent heat of vaporization), and then the gaseous water vapor enters the air, so the water vapor in the air itself contains a large amount of heat. By its very nature, all the heat it absorbs comes from the heat the sun gives to the earth, so this part of the energy is also part of the solar energy. The amount of empty gas is infinite relative to humans, so the amount of heat in the air vapor is also infinite. This part of the heat is always stored in the water vapor in the air. When the water vapor is condensed, it will be released. In this process, the water will show the phenomenon of gas and liquid coexistence, and the heat is obtained during this transformation. Released. Since the formation of water vapor is spontaneous, the heat is automatically entered into the water vapor, so this part of the energy is unpaid and unlimited.

Since this part of the energy is stored in the water vapor in the air and is obtained from the conversion process of water vapor and liquid water, it is named as “water vapor energy”.