think of it as a pneumatic equation
when you apply a measured amount of pressure to compress a certain amount of air you get something that can be measured in PSI (pounds per square inch)
i guess torx then is measured in HOR (Height Of Rice)
you add the more rice, it will be taller BUT if you lower the pressure (by changing the proper weight sumo wrestler with a midget for instance) it will also get taller, and that will throw off the chart