Steam or water vapor?

Water vapor or water vapor is correct.

Water vapor refers to the water vapor in the atmosphere. The content of water vapor in the atmosphere is very small, but it varies greatly, ranging from 0-4%. Most of the water vapor is concentrated in the lower layer, half of which is below 2 km, and three quarters of which is below 4 km. The water vapor below 10- 12 km accounts for about 99% of the total water vapor.

Water vapor is an ancient philosophical concept, which refers to the essence of water. Water vapor also refers to cloud gas; Fog on the water. Water vapor also refers to edema, such as water vapor disease, including skin water, normal water and stone water.

Source of water vapor

The water vapor in the atmosphere comes from the underlying surface, including the evaporation of water surface, wet object surface and plant leaf surface. Because the atmospheric temperature is much lower than the boiling point of the water surface, water has a phase change effect in the atmosphere. The content of water vapor in the atmosphere changes greatly, which is the main function of weather change. Clouds, fog, rain, snow, frost and dew are all forms of water vapor. ?

Water vapor can strongly absorb and emit long-wave radiation on the surface, and evaporation and condensation of water vapor can absorb and emit latent heat, which directly affects the temperature of the ground and air and the movement and change of the atmosphere.