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when i was microwaving the food, i wondered if we can apply the ideal gas law. for example, if you used one of those ziplock box thing, seal it tightly and throw it in the microwave and heated it, can we apply the law? since PV=nRT, and since microwave raises the temperature, the PV must go up along with the temperature. since the volume is kept constant, well...ideally, so then the pressure better go up. so if you stop and think, there is one awesome thing you could make. you could make an explosion with this! not that i tried this before but wouldnt it be kinda cool to see something like that? this could also be presented by a bag of popcorn. when you heat that, it expands. in other words, the volume goes up because the pressure goes up due to the change in kinetic energy.