What two types of scientific knowledge can be expressed as mathematical equations

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.

Mathematical equations can express dependencies between things, for example the relationship between the speed and acceleration. This can be summarized under "scientific laws".

More complex laws can represent models, for example a model of a human brain on a neuronal level could be based on complex mathematical equations.