Dr. Reino Hakala is a professor emeritus at Governor's State University, Once the Dean of Science there, he now teaches mathematical . As a teaching aid, Professor Hakala created a model of the relationships of the various aspects of thermodynamics. It is a very interesting model because it shows how all the parts are related together. I have taken the content of his model, and expressed it in tetronic notational form as well. This example using the notation demonstrates the versatility of this archetypal principle the simplest form of which is three.

When:

- H is Entralpy
- G is Gibbs free energy
- E is internal energy
- S is entropy
- T is absolute temperature
- P is pressure
- V is volume
- A is Helmholz free energy

- . The original model, what looks like a nested set of boxes, was created by him as a teaching aid. He wanted to show the relationships among the various aspects of thermodynamics. I took his model and restated it in tetronic notation.
**Tetronic Notation Definitions**All horizontal is whatever All vertical are relationships