Add 27315 to C and you now have a measurement in kelvin. Is the percentage tire pressure change with temperature. That is the ratio PT constant when the volume is kept constant.
In each of these equations VVolume and TTemperature.
It states that the volume of a fixed mass of a gas is directly proportional to the temperature. This means that when we hold amount and volume of gas constant the pressure of gas will increase as its temperature increase. 1181 P V constant at constant n and T. T is the absolute temperature of the tire air.