Question 1 (10 marks) An oxygen cylinder used as a standby source of oxygen contains 1.0 ft³ of Oz at 70°F and 200 psig. If the atmospheric pressure is 29.92 in. Hg, what will be the volume of this O₂ in a dry-gas holder at 90ºF and 4.0 in. H₂O above atmospheric pressure. Answer: 15 ft at 90°F and 4 in. H2O gauge