Question

Which of the following is used for preservation of biological substances and food materials?

• A. Liquid ammonia
• B. Liquid dinitrogen
• C. Liquid sulphur dioxide
• D. Carbon dioxide

Answer 1

The correct option is B Liquid dinitrogen

Liquid nitrogen has many uses, mainly based on its cold temperature and low reactivity. Examples of common applications include:

1. The freezing and preservation of food products

2. The preservation of biological samples, such as sperm, eggs, and animal genetic sample.

3. Use as a coolant for superconductors, vacuum pumps, and other materials and equipment.

4. Use in cryotherapy to remove skin abnormalities.

5. The shielding of materials from the oxygen exposure

6. The quick freezing of water or pipe to allow work on them when valves aren't available

8. A source of extremely dry nitrogen gas.