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Flasks, Dewar

Definition : Containers (flasks) designed for temporary storage of cryogenic liquids. These flasks typically are a double vessel container consisting of two metallic or glass vessels nested one inside the other and sealed together at the neck; the opposing surfaces of the two vessels are covered with metal or other reflective coating to avoid heat transmission by radiation. The insulated inner vessel contains the cryogenic liquid at very low temperatures (typically up to -200?C/-328?F or less). Vacuum in the space between the vessels provides insulation to minimize heat transfer to the liquid from the environment due to convection and/or conduction; the container should include a vent line for slow release of the gas from the slowly boiling cryogenic liquid due to the higher room temperature, especially when the container is not used for a long period of time. Large capacity Dewar flasks (30, 50 liter capacity or more) are used in supply centers and in most large healthcare facilities for storage of cryogenic gases before their distribution; smaller flasks are used for particular applications (e.g., cryosurgery).

Entry Terms : "Dewar Flasks"

UMDC code : 15030

   

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