What are the differences between vapor, steam and humidity?
Vapor is the invisible gas that occurs when water is heated to any temperature. Steam is the invisible vapor that occurs when water is heated to the boiling point (212°F). Humidity is the amount of water vapor in the air. When air holds as much moisture as possible at a certain temperature it is said to be at saturation. The higher the air temperature, the more moisture air can hold. For example, when the weatherman says, “relative humidity,” he is comparing the amount of water vapor in the air relative to the amount required for saturation. Click here for more detail and animation on this subject.
