How vacuum coffee makers work Heres the simple version. - You put water in the lower chamber and ground coffee in the upper chamber. - When heat is applied to the lower bowl, the water rises up a central stem and mixes with the ground coffee.
How do vacuum pot coffee makers work? The buildup of steam in the lower bowl forces the water up into the funnel, where it mixes with the ground coffee. A quick stir may be needed to wet the grounds into the water. A small amount of water is left behind in the lower bowl.
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