The Rockwell C scale is a method used to measure the hardness of materials, particularly metals. It assesses how resistant a material is to deformation when a specific load is applied. The scale uses a diamond-tipped indenter that penetrates the material under a predetermined load, and the depth of the indentation is measured to determine hardness. The results are expressed as a number, with higher values indicating harder materials. The Rockwell hardness test is widely used in manufacturing and engineering to ensure materials meet required specifications for strength and durability. It is a quick and efficient way to evaluate material properties.