Definition: Cryogenic liquid at -196°C, used for ultra-low temperature applications and rapid freezing.
Applications:
- Cryogenic freezing (IQF products, high-value items)
- Biological specimen transport
- Ultra-low temperature storage
- Emergency cooling
Advantages:
- Extremely rapid freezing (seconds to minutes)
- Excellent product quality (smallest ice crystals)
- No mechanical equipment required (passive)
Disadvantages:
- High cost (R15-40 per liter depending on volume)
- Requires specialized insulated containers (dewars)
- Asphyxiation hazard (displaces oxygen)
- Cold burn hazard (extreme cold)
- Nitrogen evaporation losses
Safety: Requires ventilation, protective equipment, proper handling procedures
Related Terms: Cryogenic, Dry Ice, Rapid Freezing, Dewar Flask