1. The problem statement, all variables and given/known data a) what is the density of dry air when the surface pressure is 1010hPa and the temperature is 27°C. b) what is the internal energy of 1kg of dry air under these conditions? 2. Relevant equations P=p*R*T where P is pressure and p is density. 3. The attempt at a solution a) p = RT/P by solving it gives me [287*(273+27)] / 101000 => 0.852kg/m can someone please check what i did for part (a) is right or not? b) i don't really get where to go with this question. So some help would be really appreciated thanks!