What causes bathroom steam?
Even though your shower water is nowhere near the boiling point of 100°C, some of the water molecules have enough energy to break free and become invisible water gas molecules. In other words, steam. They’re incredibly light, so easily stay suspended in the warm air. If the invisible steam meets colder air and cools down, the molecules start to join together to make tiny droplets of liquid water. These droplets make up the visible clouds that you see in your bathroom.Video - how it works