what did you guys write for the Metal rod AB? I made some crap up about Left hand rule etc, but how does the metal rod move? I said it moves to the right. Also can someone explain the loading and unloading pressure experiment? I read the thing 15 times and I still didnt understand the loading and unloading thing. The volume recorded for loading and unloading are always the same or very similiar, but shouldnt the volume for unloading be much bigger??? Oh and was it supposed to be a curve or line of best fit?