2015 USA Physics Olympiad Exam Part A 13 constant pressure.Since Z is the point where all of the gas has changed to liquid,it must be on the coexistence curve.But on PV diagram it is just to the right of point A. It is expected that the examinee will know that the volume of the gaseous state is on the order of 2000 times the volume of the liquid state. Points A and B must be at the correct location in both figures.Points C,D,W,X,Y,and Z must be at the correct location in the PT diagram.Points C and D must be at the correct pressure, but can be in the V range 1000 to 5000 for the PV diagram for partial credit.Points X and Y must coincide with C on the PV diagram.Points W and Z must be at the correct pressure,but can be located in the V range 1 to 2 for full credit but 2 to 5 for partial credit. Copyright C2015 American Association of Physics Teachers2015 USA Physics Olympiad Exam Part A 13 constant pressure. Since Z is the point where all of the gas has changed to liquid, it must be on the coexistence curve. But on P V diagram it is just to the right of point A. It is expected that the examinee will know that the volume of the gaseous state is on the order of 2000 times the volume of the liquid state. Points A and B must be at the correct location in both figures. Points C, D, W, X, Y, and Z must be at the correct location in the P T diagram. Points C and D must be at the correct pressure, but can be in the V range 1000 to 5000 for the P V diagram for partial credit. Points X and Y must coincide with C on the P V diagram. Points W and Z must be at the correct pressure, but can be located in the V range 1 to 2 for full credit but 2 to 5 for partial credit. Copyright c 2015 American Association of Physics Teachers