French:

Un cylindre contient 0,020 m3 d'oxygne molculaire temprature 25C et pression de 15 atm. Quel serait le volume de ce gaz une pression d'une atmosphre ? Un patient respire cet oxygne l'aide d'un masque un taux de 0,0080 m3/minute pression atmosphrique. Aprs combien de temps le cylindre sera-t-il 'vide' i.e. sa pression sera 1 atm ?

English:

A cylinder contains 0.020 m3 of molecular oxygen at a temperature of 25C and a pressure of 15 atm. What would be the volume of this gas at a pressure of one atmosphere? A patient breathes this oxygen through a mask at a rate of 0.0080 m3/minute at atmospheric pressure. After how long will the cylinder be 'empty' i.e. its pressure will be 1 atm ?