1. Storage enterprises: Nitrogen-related storage enterprises use liquid nitrogen to provide a low-temperature environment for freezing, refrigerating and preserving goods, frozen food, medicines, etc.

2. Aquaculture enterprises: Aquaculture enterprises use liquid nitrogen to provide a low-temperature environment for animal products, frozen meat and seafood.

3. Catering enterprises: Catering enterprises use liquid nitrogen to make special frozen snacks, ice cream or provide cold drinks.