9. [Computer environments](/MSP/Materials/Computer%20tools) for manipulation of mathematical models.
2. **Mechanistic mathematical modeling**
-
1. Extensive properties ([**extensities**](/MSP/Materials/model-intro/state-vars-extensities.png)) and the remaining system variables:
+
1. **Intensive** and **extensive** properties and **state variables** - [definition](https://en.wikipedia.org/wiki/Intensive_and_extensive_properties).
