What is dewer tank?

A Dewar tank is a type of vacuum flask specially designed for storing and transporting liquefied gases such as liquid nitrogen, oxygen and argon. It features a double-wall structure, with an inner vessel and an outer jacket. The space between the two walls is evacuated to create a vacuum, which helps to minimize heat transfer and maintain the temperature of the stored liquid. Dewar tanks come in various sizes and shapes, from small handheld flasks to large industrial vessels. They are commonly used in scientific, medical, and industrial applications where the storage and transportation of liquefied gases are required.