Brain teaser on inception pressure cookers

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Placing a smaller pressure cooker inside a larger one, both rated for the same temperature and pressure, raises questions about pressure dynamics. The inner cooker would not reach double the psi because the pressure inside both cookers is determined by the external conditions of the larger cooker. Instead, the inner cooker would equalize to the same pressure as the outer one, preventing any risk of explosion. The discussion highlights the importance of understanding pressure principles in closed systems. Overall, the scenario illustrates that pressure does not simply double in nested pressure cookers.
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Ok, so my room mate and I were talking and came up with this question.
What would happen if you placed a smaller pressure cooker inside of a larger one?
Both are rated for the same temp and pressure.
Would the one inside reach double the psi?
Would it blow up?
 
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Why would it? It's at the same temperature as the outer one and will therefore be at the same pressure.
 
So it should just double the pressure inside the smaller one?
 

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