Liquid nitrogen dewar also known as a cryogenic dewar or LN2 dewar, is a specialized container
designed for the storage and transportation of liquid nitrogen (LN2) at extremely low
temperatures. Liquid nitrogen is a cryogenic liquid with a boiling point of around -196 degrees
Celsius (-321 degrees Fahrenheit) at atmospheric pressure. Due to its extremely cold
temperature, it requires specialized storage solutions to prevent rapid evaporation and
maintain its cryogenic properties.
Here are some key points about liquid nitrogen dewars:
Design and Construction: Liquid nitrogen dewars are typically constructed from materials with
low thermal conductivity, such as stainless steel or glass-reinforced plastic, to minimize heat
transfer from the environment. They consist of an inner vessel to hold the liquid nitrogen, an
insulating vacuum layer to reduce heat transfer, and an outer protective casing.
Double-Walled Insulation: The most common design for liquid nitrogen dewars involves a
double-walled vacuum insulation. This vacuum layer between the inner and outer walls
significantly reduces heat transfer through conduction and convection, helping to keep the
liquid nitrogen cold and reducing the rate of evaporation.
Capacity: Liquid nitrogen dewars come in various sizes, ranging from small containers with
capacities of a few liters to large tanks that can hold thousands of liters. The choice of dewar
size depends on the intended use, storage duration, and amount of liquid nitrogen needed.