Acid-base and redox chemistry are the two most fundamental concepts in general chemistry. Both are taught already in school. However, both concepts are usually limited to one
medium/solvent, although they are related through the gaseous hydrogen atom delivering the proton for Brønsted acidity and the electron for redox chemistry. In our work we describe, how the ideal
proton gas and the ideal electron gas form the reference states for the absolute pH Brønsted acidity scale and the absolute pe redox scale.