Hello all, some colleagues and I have run across a problem that we cannot seem to explain, I was hoping to find some guidance here. The problem came about from messing with an air over hydraulic system. I have attached a very rudimentary mspaint picture with our scenario. Using 3 in place of pi for simplicity, the large cylinder is cyl A and the small B in both examples. Area of circle for cylinder A = 75in^2 Area of circle for cylinder B = 3in^2 P=f/a Force on Cyl A= 7500lbs Force on Cyl B= 2500lbs Basically the things I don't understand are: a. Is pressurizing the top of Cyl. A equivalent to placing (75) 1"x1", 100lb weights on top of cyl a. b. if I put a pressure gauge on the other side of cylinder b, what reading would I get from the gauge? and c. Are the first and second configurations functionally identical? (I assume your just replacing the fluid as the medium of transfer with a rod) I hope I have adequately explained the scenario with our questions, I'm sure its very simple, but short of mocking something up with PVC we don't quite understand the mechanics of what is going on here. I appreciate any guidance. Edit: Added Picture, also I would like to ignore the fact that the second configuration would likely need to be vented in between the top and bottom to prevent air from compressing due to a change of volume.