4. A 400-L cylinders of oxygen gas is compressed to 15000 kPa. If this pressure is increased to 30000 kPa, what volume of oxygen can a cylinder supply at this pressure?​

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

Idont know. if you want an answer you need to give us some context dude.