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After placing an object into methylene chloride to dissolve epoxy, in a sealed jar, and then later opening the jar, it was found that the pressure inside had increased noticeably above atmospheric. My first thought that this was because the vapor pressure of methylene chloride at room temperature is higher than atmospheric. But if that were so, methylene chloride ought to spontaneously boil in any open container, which it does not. Any idea what is happening?I have had similar experiences with acetone, straight out of the source can with no additional objects present in it.