Why do liquid molecules have some short-range order but no permanent crystal pattern?

In the liquid state of matter, molecules exhibit short-range order because they remain in close proximity to one another, often packing in a manner similar to their corresponding solid phase. This means that the immediate neighbors of a molecule are likely to be found at specific, preferred distances, creating a localized structure.12

However, liquids lack a permanent crystal pattern—or long-range order—because their molecules are not fixed in space. Unlike atoms in a solid, which oscillate about stable, fixed points in a definite lattice, molecules in a liquid possess sufficient thermal energy to remain mobile. Because these molecules are in constant motion and continually wander throughout the material, any structural arrangement beyond the first or second layer of neighbors becomes uncorrelated. Consequently, while a liquid maintains a high density similar to a solid, its lack of enduring atomic positions prevents the formation of a rigid, crystalline structure.3412