In material mechanics, strength refers to a material's ability to withstand a load without failure or plastic deformation. The link between external loads applied to a material and the consequent deformation or change in material dimensions is referred to as material strength. These characteristics must be considered when constructing structures and equipment so that the material chosen has sufficient strength to resist applied loads or forces while maintaining its original shape. The ability of a material to endure this imposed stress without failure or plastic deformation is its strength.