Strong - Needs a large fore per unit area before it breaks, Weak - Opposite of strong, breaks easily, Compression - A pushing force that squashes something, Tension - A force that pulls something and stretches it, Hard - Resistant to deformation (difficult to sctratch), Soft - Opposite of hard, deforms easily, Flexible - Easy to deform elastically (returns to original shape when stress is removed), Stiff - Opposite of flexible, difficult to bend, Ductile - Easy to deform plastically (does not return to original shape), Tough - Requires lots of energy to fracture or break, Brittle - Cracks or breaks without deformation often very readily, Density - Lightweight etc. mass per unit volume, Refractive index - Describes how easily light passes through a transparent substance, Resistivity - How difficult it is for electrical current to flow, Conductivity - Opposite of resistivity (how easy it is for electrical current to flow),

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