American Chemical Society (ACS) Laboratory Safety Practice Test

What is a primary hazard associated with cryogenic liquids?

1. They are always safe to handle

2. They can cause severe frostbite

3. They have no effect on health

4. They do not require special storage

The correct answer is: They can cause severe frostbite

Cryogenic liquids, which are substances that exist in a liquid state at very low temperatures, pose significant hazards, particularly the risk of severe frostbite. When skin comes into contact with these extremely cold substances, they can rapidly freeze tissue, resulting in severe injury. This condition occurs because the low temperature of cryogenic liquids can cause the moisture on skin or tissues to freeze, much like how cold climates can lead to frostbite from prolonged exposure to cold air. In contrast, the other options suggest misconceptions about cryogenic liquids. For example, claiming they are always safe to handle ignores the fundamental risks they present, including severe mechanical and thermal hazards. Stating they have no effect on health disregards potential injuries or physical reactions that can arise from exposure. Moreover, suggesting they do not require special storage fails to recognize the importance of proper containment and handling procedures necessary to prevent accidents and ensure safety, as these liquids can pose risks of leakage and pressure buildup if not stored correctly.