Hagen is located in Germany (Regierungsbezirk Arnsberg, North Rhine-Westphalia) and time zone Europe/Berlin.
Places nearby are Herdecke, Wetter and Ennepetal.
Cologne is 63 km away, Frankfurt am Main is 168 km away and Hamburg is 314 km away as the crow flies.
Distances from Hagen to the most important cities in Germany and the world.
51.3608100°
7.4716800°
Law describing the pressure drop in an incompressible and Newtonian fluid
https://en.wikipedia.org/wiki/Hagen–Poiseuille_equation