Humidity = Water Vapor

Water vapor is water in a gas form that is held in the air until it changes back to water. You know, sometimes it s sticky outside in the summer - that s just water held in the air. The water can change into fine droplets by "condensing" in the air, and we get clouds. When the droplets get big enough, they are pulled to the earth by gravity as precipitation, better known as rain, sleet, snow, hail, dew, or frost.