The shape and tight fit matter, but if the cylinder is metal and the mixture has cooled, it's not just about finesse—it's about overcoming a physical lock.

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The metal cylinder would act like a piston, sealing the cooled mixture in place—so it's not just about force, it's about breaking that vacuum.

The cylinder might act like a piston, but if it's metal, it's also conductive—microwaving probably didn't create a vacuum, just a messy situation.