Is dp based on the physical size of the screen? (dp =1/160 of an inch)

Question

Is this definition correct?

dp Density-independent Pixels - 1/160 of an inch based on the physical size of the screen.

I have found conflicting info

Answer 1

Check out this out after 20:00

http://www.youtube.com/watch?v=pBKGbCu0pJg&list=PLWz5rJ2EKKc8j2B95zGMb8muZvrIy-wcF

Join Nick Butcher, Adam Koch and Roman Nurik discussing all about Android Units of measure.