Vacuum flask  From Wikipedia, the free encyclopedia Jump to:
navigation, search Laboratory Dewar flask, Deutsches Museum,
Munich Diagram of a vacuum flask     The vacuum flask was
designed and invented by Scottish scientist Sir James Dewar in
1892 as a result of his research in the field of cryogenics and
is sometimes called a Dewar flask in his honor. While performing
experiments in determining the specific heat of the element of
palladium, Dewar formed a brass chamber that he enclosed in
another chamber to keep the palladium at its desired
temperature.[1] He evacuated the air between the two chambers
creating a partial vacuum to keep the temperature of the
contents stable. Through the need for this insulated container,
James Dewar created the vacuum flask which became a significant
tool for chemical experiments but also became a common household
item. The flask was later developed using new materials such as
glass and aluminum; however, Dewar refused to patent his
invention.[1]  From Weinhold 1881 described