What are the characteristics of water vapor?

Water vapor, abbreviated as water vapor or steam, is the gaseous form of water (H2O). When water reaches the boiling point, it becomes steam. At sea level, the boiling point of water is100 c or 212 f or 373.15 k, and when the water is below the boiling point, it can slowly evaporate into steam. However, in the extremely low pressure environment (below 0.006 atmospheric pressure), ice will sublimate directly into water vapor. Water vapor may cause the greenhouse effect. It is a greenhouse gas. In addition, water vapor is not an energy source, nor a secondary energy source, nor a renewable energy source. Water vapor is just a manifestation of water in gaseous state. Gaseous water is a small but important part of the atmosphere. About 99.99% is in the troposphere. The stage when water vapor condenses into liquid or ice is mainly completed by clouds, rain, snow and other sediments, and all these are also the most important weather elements.