Those gases are then distilled into a liquid that researchers say can be used to make plastic.

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Knowing very little about liquid nitrogen I set off happily to BOC Gases intent on gettin' me some.

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They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.

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To do that they need not one but two energy-hogging air chillers, one to make liquid oxygen and another to remove CO 2 from the flue gases.

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