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When the coffee molecules are poured into the container they block water vapor molecules from escaping. Boiling water turns the water to vapor which then excapes from the top of the container. When there is a coffee in there they actually block the escape of the water vapor or steam. The water boils again when it reaches a certain higher temperature so the water molecules can move fast enough to once again escape the container was steam. This is called Boiling Point Elevation.

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