NOTE! A newer video on this topic is available:    • How to find any value in logarithmic ...   , hopefully without any mistakes. In this video there is an error with lg(1.56), it should be 0.19312. I think you find the newer video easier to understand and without errors.





Explains how to read logarithmic diagrams carefully by only calculating one logarithm.

The graph used in this demonstration is a graph used when calculating mass diffusivities in gases. T* is the dimensionless temperature.

I follow the ISO 80 0002 standard when writing logarithms, i.e. lg is the 10base logarithm, ln is the natural logarithm and the “log” symbol is only allowed if a base is specified as a subscript.