[填空题]
A tire is filled wit.rmaepg9n/ 9zvu tf: or.4a)rh 7qhp;c;xgb-bair at 15 $^{\circ} $ C to a gauge pressure of 220 kPa. If the tire reaches a temperature of 38 $^{\circ} $ C, what fraction of the original air must be removed if the original pressure of 220 kPa is to be maintained? %