State of matter refers to the physical state of substances based on their temperature and pressure. The three main states of matter are solid, liquid, and gas. However, there are other states of matter which exist under extreme conditions such as plasma, Bose-Einstein condensate, and superfluid. Plasma is a highly energetic, electrically-charged gas which exists at high temperatures. Bose-Einstein condensate is a state of matter where atoms behave as a single entity at ultra-cold temperatures. Superfluid is a unique liquid which flows with zero viscous resistance. These synonyms for state of matter help to better understand the dynamic range of physical states in the natural world.