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.
You can apply to become a Reservist officer when you're 17 years and 9 months-ready to start when you turn 18. The last point that you can apply to join is when you're 48 years and 9 months, although there are higher age limits for professional or specialist applicants.o join as a regular soldier you need to be at least 16 years old, although you can start the application process earlier, with your parents' permission. If you're under 18, you'll also need parental consent to join.