Home › Forums › setting the stage › solids as quantum systems › Definition of a solid This topic has 1 reply, 2 voices, and was last updated 2 weeks, 1 day ago by SeppeLefevere. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts September 24, 2025 at 10:48 am #13032 rashurkoParticipant A solid is a crystalline material with a well-defined shape, and where the bonding energy between the individual atoms is strong enough (greater than the internal thermal energy) to hold them together in absence of external forces. September 27, 2025 at 12:35 pm #13152 SeppeLefevereParticipant There are also solids that are non-crystalline Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In