Solid state science

The ancient picture of a universe filled with matter composed of but a few fundamental elements faded after the scientific revolution. By the nine­teenth century, it had been replaced by a far more lively and complex view in which the materials in nature were seen as a rich array of elements in countless combinations. Three of the four Aristotelian elements — earth, water, and air — survived as categories for describing the ordinary states of matter: solid, liquid, and gas. The fourth element — fire — eventually became associated with ionized gases (plasmas).