A professor once told me this: if you could measure the area of contact between the tire and ground, and know the weight of the vehicle, you can know the air pressure in your tires by: # of tires x area of contact between tire and ground in inches, devided by the weight of the rig in lbs. So when a truck or trailer is loaded, there is more of the tire in contact with the ground, and less when unloaded, allowing for pressure to stay constant. The key is pressure is lbs/inch squared often noted psi.
Now to the original question, Im not sure, but perhaps the amount of work needed to change the pressure of a loaded tire 10psi is greater than to increase the pressure of the unloaded tire 10psi, which could be noted in time required.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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