I'm starting the extended essay and have decided to explore more on finding the viscosity of newtonian liquids. However I was told by my supervisor that this topic is too broad, and that I should come up with a more specific topic/research question— one that possibly relates to a real life, everyday situation (if possible). He suggested to refine my research to exploring the different methods of finding viscosity and determine which one is more accurate. I, however, still think that this topic is not suitable to be an extended essay research question. Anyone can help with how I can turn this into an extended essay suitable topic?