Leaving Certificate Engineering Practice Exam 2025 - Free Engineering Practice Questions and Study Guide

The term that is not associated with the properties of a lattice in materials is liquid viscosity. When discussing the properties of a lattice, one typically focuses on structural and thermal properties that are relevant to solid materials.

Atomic density is crucial as it refers to the number of atoms per unit volume in a given crystal structure, which influences various mechanical and thermal properties. Shear strength is directly related to how materials respond to shear loads, which is influenced by the arrangement of atoms in a lattice. Thermal conductivity is important as it describes how well heat can be conducted through a material, which is also related to the lattice structure, particularly in crystalline solids.

Liquid viscosity, on the other hand, is a property related to the flow of liquids and describes how a liquid resists deformation under shear stress. This property is relevant in fluid dynamics and not applicable to materials with a defined lattice structure, as solids exhibit different behaviors than liquids in terms of atomic arrangement and forces. Thus, liquid viscosity does not pertain to the characteristics typically associated with solid lattice structures.