Definition: Extremely low temperatures, typically below -150°C, achieved using liquid nitrogen (-196°C) or dry ice (-78.5°C).
Applications:
- Biological samples and specimens
- Certain pharmaceuticals and vaccines
- Rapid freezing of high-value products
- Emergency cooling for equipment failures
Why It Matters: Specialized handling requirements, safety considerations (asphyxiation risk, cold burns), and regulatory compliance for transport of cryogenic materials.
Related Terms: Liquid Nitrogen, Dry Ice, Deep Frozen, Cryogenic Freezing