2-20. The Buri Khalifa in Dubai is currently the world's tallest building. If air at 40C is at an atmospheric pressure of 105 kPa at the ground floor (sea level, determine the absolute pressure at the top of the building, which has an elevation of 828 m. Assume that the temperature is constant and that air is compressible. Work the problem again assuming that air is compressible. Round off the answers to four significant digits