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Physics - Thermal energy question

https://googledrive.com/host/0B1Ziq.../January 2011 QP - Unit 5 Edexcel Physics.pdf

https://googledrive.com/host/0B1Ziq.../January 2011 MS - Unit 5 Edexcel Physics.pdf

Hello,
In the markscheme of question 11b, i dont understand how the can reaches 12 atmospheres before 900K, can anyone explain this to me.

Thanks in advance

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