Passive Scalar Source

In this project, I have taken passive scalar source flux as 32mg/s. Now, how I can interpret the result obtain from the source in context of air vs passive scalar in concentration term. What does the number on the legend signify. As I have thought that the number could vary from 0 to 1. But the number are in exponential. I want to measure the concentration of propane(passive scalar with respect to the air.
Please help in this regard.


](upload://i0JajxnLxK1OlCkLROB4sPaZ08i.png)
Link of the project

Hi there!

Perhaps this articles can help you understand the quantities:

https://www.simscale.com/knowledge-base/what-is-φ-flux-and-t1-stand-for/