This happens because the temperature at which oxygen changes from a gas to a liquid is about 13 degrees Celsius above that of nitrogen. The oxygen can be seen dripping from the can just as on a humid day you can see drops of water condense and drip from a can you take from the refrigerator.
Though you technically can join the military up to age 42, if you're 35 or over you'll need an age waiver if you've never been in the military before.
Plan the timing of your application to be sure you are age-eligible for service. 1  To enlist, you cannot be younger than 17 (18 for GED holders) or older than 39 years of age. 2  To join as an Officer, you cannot be younger than 18 or older than 34 years of age.