Why does steam form?

Answer 1

Steam, as in water steam, is formed when water reaches over the boiling point (100 degrees centigrade). The water will start to evaporate, to make water vapour, and then join the air particles in the air. Whenever there is a cold surface nearby, (such as a window) the water vapour will hit the surface and then condense (turn back into a liquid). Condensing is a process where the water vapour is cooled down to make a liquid. This process is sometimes recognised as boiling and condensing.

Answer 2

As the water is heated to the boiling point (212 degrees F) some of the molecules become gas and rise to the top, then escape from the surface of the water as steam (a colorless gas). As the steam rises away from the surface of the water, it cools slightly and the molecules become liquid again, forming a vapor above the steam. The vapor is usually called steam, but it is water vapor.

Answer 3

steam forms when water reaches boiling point and the water condenses.

Answer 4

Steam appears because the water molecules are at a different temperature to the surrounding air.

Answer 5

because the atoms have more energy and vibrate faster causing them to spread out. :)