Fluid Pressure 1 For Seal refers to the pressure exerted by the fluid on one side of the packingless seal. And is denoted by p1. Fluid Pressure 1 For Seal is usually measured using the Megapascal for Pressure. Note that the value of Fluid Pressure 1 For Seal is always negative. Typically, the value of Fluid Pressure 1 For Seal is greater than 0.