Change of Phase and Heat

In this picture heat and change of phase are demonstrated.  To stage the photo I heated up the griddle in my kitchen and lay a wet rag on top of it. This, in turn caused the water in the rag to reach it's boiling point then enough energy was added to vaporize the water and turn it in to steam, an invisible gas.  The steam then rose and cooled down and condensed back into liquid water which is what one can see in the photo.