Which is right, water vapor or water vapor?

All right. Water vapor refers to gaseous water. The density of water vapor is about 0.622 times that of dry air at the same temperature and pressure, that is, the density of water vapor is always less than that of dry air. Moisture refers to edema. Such as water-vapor diseases, including geomantic omen, skin water, yang water and Shi Shui. 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.