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I have a 1 mm thick plastic sheet, the plastic is not opaque.

Some gas pockets, I would say some bubbles, are inside the sheet; the size of the bubbles is about 1 mm.

What methods are available to know the composition of the gas that is inside the pockets?

Methods can destroy the sample.

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closed as too broad by Mithoron, Mathew Mahindaratne, Tyberius, Jon Custer, Buttonwood Jul 16 at 19:24

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Gas chromatography, possibly even GC/MS. Sample a bubble using a small syringe and put the sample through a GC/MS set up to identify common gases. $\endgroup$ – matt_black Jul 14 at 11:56