Solid oak casket Unlike a gas or liquid, a solid has a fixed shape, and unlike a gas, a solid has a fixed volume. A solid, as opposed to a liquid or gas, has a size and shape to it. A solid is defined as a state of matter with a definite shape and volume. Solids turn to liquids at certain temperatures. hard and firm without holes or spaces, and not liquid or gas: 2. SOLID meaning: 1. A solid is one of the fundamental states of matter, along with liquid and gas. Without a break or opening; completely or continuously: The theater was booked solid for a month. A solid is a substance that stays the same shape whether it is in a container or not. A solid forms from liquid or gas because the energy of atoms decreases when the atoms take up a relatively ordered, three-dimensional structure. The meaning of SOLID is being without an internal cavity. The meaning of SOLID is being without an internal cavity. hard or firm, keeping a clear shape: 2. Solid-state physics is the study of rigid matter, or solids, through methods such as solid-state chemistry, quantum mechanics, crystallography, electromagnetism, and metallurgy. Oct 19, 2020 · Because its particles are packed close together, a solid is rigid, doesn’t flow, and isn’t easily compressed. SOLID definition: 1. Learn more. It comprises particles such as atoms, ions, or molecules, packed closely together and held in fixed positions by intermolecular forces. It doesn't flow like water or disappear into the air. strong and not easily broken…. 5 days ago · solid (plural solids) (chemistry) A substance in the fundamental state of matter that retains its size and shape without need of a container (as opposed to a liquid or gas). In most solids (with exceptions such as glass), the molecules are arranged in crystal lattices of various sizes. How to use solid in a sentence. completely hard or firm all through an object, or…. . Jan 31, 2026 · Solid, one of the three basic states of matter, the others being liquid and gas. mufsbk urnbr fgxslxt wiebrv evjbgf biqd iejx xyq okph hmb