A vacuum flask or Dewar flask has the remarkable capacity to hold extremely cold liquids like liquid nitrogen for a considerable length of time. The boiling point of liquid nitrogen is 77K compared to a room temperature of about 300K. You can hold liquid nitrogen for about a day without even a cover on the flask! Clearly, the flask is able to effectively block heat transfer from the outside either through the walls or through the open top.
Dewar flasks in stainless steel:
Our dewar flasks are rust-free, non-corrosive, hygenic and strong. Double-walled boroscilicate glass, vacuum pumped and silvered insures efficient storage, transport and use of liquid nitrogen and dry-ice. These Dewar Flasks have an all-stainless steel vented lid with self-contained insulation. Lid-clamps secure the lid for safe transportation and minimizing spillage.
Available in 4 capacites/sizes; 1000 - 2000 - 4500 - 7000 ml
Dewar flasks in enamelled steel:
Blue metal cased economy Dewar Flasks are rust and corrosion resistant. Double-walled silvered boroscilicate glass, vacuum pumped insures efficient storage, transport and use of liquid nitrogen and dry-ice. Lid vent safely vents off evaporating gas. Safe for use with all liquid gases and dry-ice.
Available in 4 capacites/sizes; 1000 - 2000 - 4500 - 10000 ml