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A self-pressurising dewar (silver) being filled with liquid nitrogen from a larger storage tank (white). A cryogenic storage dewar (or simply dewar) is a specialised type of vacuum flask used for storing cryogens (such as liquid nitrogen or liquid helium), whose boiling points are much lower than room temperature.
Liquid nitrogen is a compact and readily transported source of dry nitrogen gas, as it does not require pressurization. Further, its ability to maintain temperatures far below the freezing point of water, specific heat of 1040 J ⋅kg -1 ⋅K -1 and heat of vaporization of 200 kJ⋅kg -1 makes it extremely useful in a wide range of applications ...
A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that slows the speed at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible.
Cryogenically preserved samples being removed from a dewar of liquid nitrogen. Cryopreservation or cryoconservation is a process where biological material - cells, tissues, or organs - are frozen to preserve the material for an extended period of time. [1]
The architecture of a dry shipper encompasses two primary components: an internal canister and an external protective shell. The inner canister, designed to hold biological specimens, is positioned within the vapor phase of the liquid nitrogen. [1]
The refrigerated transport dewar was based on a design by the Arthur D. Little Company and produced by the Cambridge Corporation using a closed cycle helium refrigerator, the 2000 liters of liquid hydrogen could be stored or transported indefinitely with no loss as long as the refrigerator was operated.