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What is a container or dewar?
A dewar container, also known as a dewar flask or dewar, is a jar that has a vacuum space between its exterior walls and a cold liquid. A thermos is a popular kind of dewar container that you may use to keep beverages cool.
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More than a century ago, Sir James Dewar created liquid hydrogen. In 1892, he created a container that would keep the liquified gas cool for research purposes. A dewar can be as basic as an mouth and double walls. Features like lids, inlets, outlets, valves, and gauges can be included in dewars designed for certain applications.
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