What are the cryogenic uses of liquid nitrogen?

Liquid nitrogen is a vital substance in cryogenics, the study and application of low-temperature phenomena. Because it boils at approximately −195.8 °C (−320.4 °F), it is highly effective for cooling and preserving materials that would otherwise deteriorate at room temperature.12

Key cryogenic applications of liquid nitrogen include:

• Food Preservation: It is used to freeze produce quickly and inexpensively by spraying it directly onto the items, where it vaporizes and absorbs the heat content.1
• Medical and Biological Storage: Liquid nitrogen is used to preserve blood, bone marrow, tissue, bacteria, and semen. It is also essential in cryopreservation systems, where it maintains the extremely cold temperatures required to store cells and embryos.23
• Cryosurgery: A scalpel or probe cooled by liquid nitrogen is used to freeze and remove unhealthy tissue, such as warts, cataracts, tonsils, and certain tumors, often resulting in less bleeding than traditional cutting methods.1
• Scientific Research: It is widely utilized in cryogenic research to study the properties of materials at extreme temperatures.2