Liquid nitrogen tanks are specialized containers designed to store and transport liquid nitrogen, which is nitrogen in its liquid state at extremely low temperatures. These tanks are typically made of materials that can withstand the cold, such as stainless steel, and are insulated to minimize heat transfer. They come in various sizes, from small portable units to large stationary tanks. The primary use of liquid nitrogen tanks is in scientific and medical applications, including the preservation of biological samples like cells, tissues, and sperm. They are also used in industries such as food processing and cryogenics, where rapid freezing or cooling is required.