This book introduces a new graphs-based language called Formal Graphs for representing the mathematical equations found in a large number of scientific domains, including mechanics, physicochemistry, dynamics, solid state physics, rheology, surface energy, electrochemistry, and chemical reactivity. This elementary approach consists of drawing links and nodes on a graph, instead of writing algebraic equations. The graphs encourage a visual, unified comprehension of the relationships between physical concepts and variables, properties, and operators.