As I was taking a shower I witnessed temperature and thermal energy. As the water temperature increased more and more gas particles was seen in the air. The gas particles took up the space of the bathroom. That is because gas has no definite shape nor volume
As I got out of the shower I noticed my plastic shower cap had gas particles in it that collide with one another against the walls of the shower cap. This is because of pressure and concentration.
As I went up to the mirror I noticed gas particles change its state of matter, because of condensation. The gas lost enough thermal energy causing it to formed into liquid particles.