Solid is a state of matter in which atoms are closely packed and are difficult to move past each other. Solids resist compression, expansion, or external forces that would alter its shape, with the degree of resistance being dependent upon the specific material under consideration. [1]
Because its particles are packed close together, a solid is rigid, doesn’t flow, and isn’t easily compressed. A solid is defined as a state of matter with a definite shape and volume.
A solid forms from liquid or gas because the energy of atoms decreases when the atoms take up a relatively ordered, three-dimensional structure. Solids exhibit certain characteristics that distinguish them from liquids and gases.
1. Without a break or opening; completely or continuously: The theater was booked solid for a month. 2. As a whole; unanimously: The committee voted solid for the challenger.