In my work place, we have a drum that has propene inside at a pressure of around 2,5 bar and at a temperature of around -15ºc and the boil-off of that drum is aspirate by a compressor and is compressed to a pressure around 11 bar to 15 bar and a temperature of around 65ºc to 75ºc. After the compressor the high pressure gas goes to a ventilator, and the gas is cooled down with the ouside air at ambient temperature and that makes the gas to cool down and to change to a liquid at high pressure. After this the liquid is stored at another drum.
My question: is this consider liquifying a gas under pressure?
Note: is not for school purposes.