1. The problem statement, all variables and given/known data In the picture below, the pressure on either side of the piston is equivalent. The question asks which direction the piston moves (or if it even moves at all). http://imageshack.us/a/img203/1830/photoon3613at919pm.jpg [Broken] 2. Relevant equations P1*V1 = P2*V2 = C P = F*A 3. The attempt at a solution Moving the piston to the left decreases volume in the cylinder, and moving the piston to the right increases the volume in the cylinder, but I see no reason for the piston to move if the pressure on both sides is equal. Also, the force on the right side of the piston is less than that on the left side, making the force greater on the right side if we use the equation P = F*A and pressure is equal on both sides. At first glance it just looks like it will not move, but I feel like I am underthinking it.