Lesson 13, part 2: measuring normal stress differences

[@andrewmountianou2697]

Once again a very nice lecture!
Are these equations the same if we use oscillatory rheometry?
Thanks in advance!

[@drbartsworldofchemeng]

Thanks again for your positive feedback! No, they won't be - in the same way that complex viscosity and shear viscosity at only the same by coincidence (look up the Cox-Merz rule and Laun's relationship for more insight!)