A model and a law can be expressed as mathematical equations.
A model could be an illustration of a concept, associate degree object or maybe a method or a system that's wont to describe and make a case for phenomena that can't be practiced directly. Models are central to what scientists do, each in their analysis also as communicating their explanations. A scientific law could be a statement supported by continual experimental observations describing the facts of the universe. For example, Newton's laws of motion have complex mathematical equations.