A liquid nitrogen cylinder is typically made of aluminum or steel and has a storage capacity of up to 50 liters. It is designed to hold liquid nitrogen under pressure and has a valve for dispensing the liquid. In contrast, a dewar is a double-walled container that is made of glass or metal and is used for the storage of liquid nitrogen. The inner wall is made of a material that can withstand extremely low temperatures and the space between the inner and outer wall is often evacuated to minimize heat transfer.

One of the key differences between a liquid nitrogen cylinder and a dewar is their storage capacity. While a liquid nitrogen cylinder can hold up to 50 liters of liquid nitrogen, a dewar can only hold a fraction of that amount. Dewars are typically used for smaller scale storage, with capacities ranging from 2 liters to 10 liters.