Home › Forums › setting the stage › solids as quantum systems › Defining solid This topic has 0 replies, 1 voice, and was last updated 10 months, 1 week ago by Eesha. Viewing 1 post (of 1 total) Author Posts February 7, 2024 at 5:00 pm #10560 EeshaParticipant A solid is a state of matter or substance that has a definite shape, mass, volume consisting of closely packed atoms or molecules in a definite repetitive (crystalline) or indefinite random arrangement (amorphous substances). 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