Lu,
You are right about the oil/alcohol detail - but I think we will understand your selection of centrifugal after all of the discussion if you could comment (by the numbers) on the logic progression I provided for vorticey on the previous page. If you address the first step that you cannot follow, then we can begin discussions there and then we can find out if any common ground exists. To do this, I propose that you concentrate soley on the logic steps, we introduce no other examples, and we discuss no other phenomena. Sorry to hijack the phase lag main topic (of which really looks as though it is getting somewhere).
Cheers,
