It refers to all the objects and materials around us.

Hardness is the ability of material to be rigid pressure that may cause deformation or change in its shape. Example, metal and wood.

Not all hard materials are unbreakable, though there are solid materials that when subjected to high stress or pressure, crumble or break easily. Example, glass and porcelain.

Elasticity is the ability of a material to be bent without breaking. Example, metal wires and plastic strings.

Elasticity is the ability of a material to be stretched and then return to its original shape after. Example, rubber band.

Gold can be hammered into flat sheets until the desired shape of jewelry is obtained. This property is called malleability. Example, silver, iron, aluminium.