Question

A commercial jet is flying at an altitude where the air pressure is 20 kPa and the temperature is −60ºC. If the air is brought inside the aircraft and pressurized to 80 kPa, what will be its temperature?

Answer 1

$$V=const\to p_1T_2=p_2T_1\\(20)(t_2+273)=(80)(-60+273)\\t_2=579\degree C$$