Define compressive strength
stress required to cause fracture
elastic modulus
stress required to cause a change in shape
ductility
dimensional change experienced before fracture
hardness
resistance of surface to indentation or abrasion
translucency
the relative amount of light transmission through an object
opalescence
the visual property of an object having a milky brightness and a play of colours from the surface
work hardening
the increase in hardness of a metal induced by physical properties such as bending or hammering