Why is there a plastic bag on oxygen masks?

Related questions

1. Are oxygen concentrators dangerous?
2. How does the oxygen mask work?
3. Can you use Vaseline while on oxygen?
4. What is the appropriate oxygen flow rate when using a non rebreather mask?
5. How many Litres is a simple face mask?
6. Does human skin absorb oxygen?
7. What is the difference between non rebreather mask and partial rebreather mask?
8. What does oxygen therapy treatment do?
9. What is an oxygen mask used for?
10. How much does oxygen facial cost?

Tags

1. #everyone
2. #airplane
3. #exhaled
4. #breath
5. #savings
6. #sustain
7. #valves
8. #until
9. #oxygen
10. #waste
11. #travel
12. #there
13. #enough
14. #reaches
15. #denser
16. #allows