A substance used as a refrigerant to preserve biological materials, food items and in cryosurgery.

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Liquid nitrogen (LN₂) is widely used as a refrigerant due to its extremely low temperature (-196 °C or -321 °F). It is essential for preserving biological materials (e.g., cells, tissues), food items (flash freezing), and in cryosurgery for destroying abnormal tissue.

The final answer is $N_{2} (l i q u i d)$ .

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