Cryogen Safety

---

1. Liquid cryogens such as liquid nitrogen can: a) cause severe burns from exposure to liquid or super cooled gas b) cause permanent eye damage c) cause death by asphyxiation d) all of the above

2. A tightly capped container of a liquefied gas will explode. a) True b) False

3. Liquid nitrogen will condense liquid oxygen out of the air. a) True b) False

4. Filling a small dewar from a self pressurized 160L dewar takes several minutes, so it isn't a problem if you make a quick trip to your office while it is filling. a) True b) False

5. Equipment attached to self pressurized dewar must be equipped with a pressure relief valve. a) True b) False

6. A dewar with a venting lid can be carried in a hallway between rooms by the handle if it is 4L or less. a) True b) False

7. A liquid nitrogen burn should be rewarmed as quickly as possible by immersing in water as hot as can be tolerated. a) True b) False

8. A dewar flask is a double walled vessel insulated by a vacuum. a) True b) False