This graph comes from the Tekscan website, where I got the pressure sensor. The one I am using corresponds to the red 25lb force range line, which is relatively linear. This shows that the pressure sensor can be used in the soft robotic gripper.
This graph shows the pressure of the gripper and the human hand over time. The left graph is for the soft robot gripper, while the right graph is for the hand pressure. Both were measured when pressing as hard as possible, which is not necessarily needed to hold an object. The soft robot's pressure only went up to .75 psi at the most, which is barely enough to hold something, but the gripper should be fine to hold things depending on the air source. A weak air source may produce too little pressure, while a strong one may produce too much. The hardest hand pressure is about 2.75 psi, which is definitely enough to hold something, but harm something fragile. Although these pressures are very different, they should not affect the overall function of the gripper too much, therefore showing that the gripper will work properly in the aspect of pressure.