Kovacs Law refers to a principle in the field of physics that describes the behavior of materials under stress. It states that the deformation of a material is proportional to the applied stress, provided the material remains within its elastic limit. This means that if you apply a certain amount of force to a material, it will stretch or compress by a predictable amount until it reaches a point where it can no longer return to its original shape. The law is named after János Kovács, a physicist who contributed to the understanding of material properties. It is commonly used in engineering and materials science to predict how different substances will react when subjected to various forces, helping in the design of structures and products.