Ian Moseley asked in USMA 9147: >'Big machines' programme on today seemed to be totally metric but I am >not sure about the quote for tyre pressures in kilograms per squatre >centimetre. Are these the normal units ? The kilogram-force is definitely not an SI unit. The SI unit of pressure is the pascal, which is a rather low presure. In Canada we use the kilopascal, symbol kPa, for both atmospheric pressure and tire pressure. James Frysinger added in USMA 9149: >You may wish to read what I wrote to Bon-Aire Industries, Inc., blind >copied to this list as USMA:9135. Their air compressor that I just >purchased used those units. > >I suspect that it is actually a direct conversion of pounds (mass) to >kilograms and square inches to square centimeters. This is one of the >hazards of converting units for quantities that one is not actually >familiar with. Traditionally engineers used pound-force and kilogram-force. Kilograms-mass per square inch is not a pressure, but it might be used as a measure of a property of sheet material. One kilgram-force per square centimetre = 98.066 5 kPa
