Home › Forums › setting the stage › solids as quantum systems › Definition solid This topic has 0 replies, 1 voice, and was last updated 2 years, 2 months ago by Dietger Van den Eynden. Viewing 1 post (of 1 total) Author Posts October 5, 2022 at 1:26 pm #6905 Dietger Van den EyndenParticipant A solid is a state of matter in which the atoms have a limited degrees of freedom. These solids can be either crystalline or amorphous material. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In