Old style pressure cookers regulated pressure by having a vent tube in the lid with a weighted stopper that sits atop it, known as a jiggle or jiggler weight. The jiggler weight seals the vent tube until enough pressure builds to move the weight, which releases pressure until the weight falls back into a sealing position. Some of them included multiple jiggler weights, such as one for 5, 10, and 15 PSI regulation. The lighter the weight, the lower the PSI regulation. My question is: what is the relationship between weight and pressure? Is it a simple linear relationship, i.e., twice the weight = twice the pressure required to move the weight? For example, if a 1.5 oz. jiggler weight regulates the pressure at 5 PSI, how heavy would it have to be to regulate the pressure at 10 and 15 PSI?