Example image of eyePlorer eyePlorer map for 'Hardness': Force Matter Phase (matter) Solid Soft matter Intermolecular force Elasticity (physics) Fracture Materials science Operational definition Plastic deformation in solids Brittleness Ductility Plasticity (physics) Toughness Viscoelasticity Viscosity Mohs scale of mineral hardness Brinell scale Hardness comparison Rockwell scale Vickers hardness test Particle size Grain boundary strengthening Bulk modulus Rigidity Shear modulus Stiffness Young's modulus Anisotropy Osmium Quartz Spall Mineralogy Sclerometer Diamond Aggregated diamond nanorod Beta carbon nitride Engineering Metallurgy Scleroscope Leeb rebound hardness test Solid mechanics Elastic modulus Yield (engineering) Stress–strain curve Strength of materials Compressive strength Shear strength Tensile strength