What is the maximum psi air can be compressed?

I have seen air compressors with a 6000 psi rating but was wondering what is the maximum air can be compressed.

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Bill says...

How long is a piece of string?

If an application exists for air to be compressed to 10,000 PSI, rest assured someone will build a compressor to do it (if it's not already out there).

This website tries to deal with the practical aspects of using industrial compressed air.

Sorry, but I really don't have any more input than that about your theoretical question.

Cheers,

Bill