Don't get conphased, join the craze!

Matter is everything that has mass, and it is made of various atoms and molecules. This variation in which atoms and molecules make something is key factor that differentiates it from everything else. However, it is not the only thing, since a cup water behaves very differently from a block of ice, despite them both being made up of the same H2O molecules. The thing that makes water and ice have such different properties is their temperature and therefore their phase.