Materials exist in four forms: solid, liquid, gas, and plasma. Solids and liquids exhibit material properties since atoms and/or molecules form a static and dynamic structure occupying a region of space with near neighbor elements experiencing similar forces. Gases loosely fit the definition of materials. If gas atoms and/or molecules exhibit a collective nature through collisions or perhaps weak electromagnetic effects in a confined region of space, then the medium suits the definition for material. A quasi-neutral gas composed of positive and negative charges known as a plasma exhibits a collective behavior by way of electromagnetic fields. If confined in a region of space, this ionized gas also suits the definition for material.