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Constant volume refers to the size of the container staying the same whereas constant pressure refers to the pressure staying the same as a result of the number of moles or volume staying the same while other factors change.
Pressure and volume are two totally different measurements, because they measure different parameters of substances and have different units. However, change in pressure, under many circumstances, could imply change in volume, and vice versa, according to the ideal gas law, PV = nRT.
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