Wilsons Sandbox

A little easier to read Pressure vs altitude and temp vs pressure Wed Dec 19, 2012 9:19 am (PST) . Posted by: "mcapocci" mcapocci Altitude Above Sea Level Absolute Barometer Absolute Atmospheric Pressure feet meters inches Hg mm Hg psia kg/cm2 kPa -5000 -1524 35.7 908 17.5 1.23 121 -4500 -1372 35.1 892 17.2 1.21 119 -4000 -1219 34.5 876 16.9 1.19 117 -3500 -1067 33.9 861 16.6 1.17 115 -3000 -914 33.3 846 16.4 1.15 113 -2500 -762 32.7 831 16.1 1.13 111 -2000 -610 32.1 816 15.8 1.11 109 -1500 -457 31.6 802 15.5 1.09 107 -1000 -305 31.0 788 15.2 1.07 105 -500 -152 30.5 774 15.0 1.05 103 01) 0 29.9 760 14.7 1.03 101 500 152 29.4 746 14.4 1.01 99.5 1000 305 28.9 733 14.2 0.997 97.7 1500 457 28.3 720 13.9 0.979 96.0 2000 610 27.8 707 13.7 0.961 94.2 2500 762 27.3 694 13.4 0.943 92.5 3000 914 26.8 681 13.2 0.926 90.8 3500 1067 26.3 669 12.9 0.909 89.1 4000 1219 25.8 656 12.7 0.893 87.5 4500 1372 25.4 644 12.5 0.876 85.9 5000 1524 24.9 632 12.2 0.860 84.3 6000 1829 24.0 609 11.8 0.828 81.2 7000 2134 23.1 586 11. 0.797 78.2 8000 2438 22.2 564 10.9 0.768 75.3 9000 2743 21.4 543 10.5 0.739 72.4 10000 3048 20.6 523 10.1 0.711 15000 4572 16.9 429 8.29 0.583 57.2 Temp vs pressure is the ideal gas law. With a tire you can approximate a constant volume so pressure and temp are inversely proportional as long as you work in absolute temperature ratios. This is temperature Rankine or Kelvin. In Rankine you add 459 to the temp in degrees f for both the numerator and denominator. For temp kelvin add 273 to the temp in regress C [Non-text portions of this message have been removed]