Home › Forums › setting the stage › solids as quantum systems › Definition of solid This topic has 0 replies, 1 voice, and was last updated 4 hours, 9 minutes ago by Sukumaran Pillai Ravi. Viewing 1 post (of 1 total) Author Posts October 23, 2025 at 7:10 am #13705 Sukumaran Pillai RaviParticipant Solid is defined as a substance that has unique shape and size that cannot be altered in rest state without any external pressure. 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