In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma. Many other states are known to exist, such as glass or liquid crystal, and some only exist under extreme conditions, such as Bose -- Einstein condensates, neutron - degenerate matter, and quark - gluon plasma, which only occur, respectively, in situations of extreme cold, extreme density, and extremely high - energy. Some other states are believed to be possible but remain theoretical for now. For a complete list of all exotic states of matter, see the list of states of matter.
a state of matter that is not a fluid is
solid