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Vacuum Coffee Makers.. Hot Spring in Your Home.. The Machines We Use Every Day and How They Work

Vacuum Coffee Makers:

There is another type of coffee maker that uses steam pressure. This type (i.e. vacuum coffee maker) consists of two containers, one above the other, connected by a tube. Water is poured into the lower container and the ground coffee is placed in the upper container. When the water is heated, part of it turns into steam, and this steam presses the remaining water and pushes it into the upper container through the tube. There it mixes with the coffee and acquires its taste and smell. And here half of the coffee preparation process has been completed.

At this time, the upper container contains a mixture of coffee liquid and ground coffee. While the lower container contains steam. The next step involves removing the liquid coffee from the coffee beans, leaving them in the upper container, and they are left in the lower container.

Why doesn't the coffee liquid drip down on its own? This is because the steam pressure in the lower vessel prevents this.

But if we turn off the flame, the steam cools and turns into water again and the steam in the vessel filled with it becomes a few drops of water. This means that there is a large vacuum in the lower vessel, and here the coffee liquid flows from top to bottom, driven by the external air pressure on its surface, and the crushed coffee beans are left behind in the upper vessel because the path between the two vessels is very narrow and does not allow solid objects to pass while the liquid leaks easily. Some coffee makers contain a cloth or paper filter that separates the two vessels. This filter replaces the narrow opening, . . . Although they both perform their work in the same way, which is to push the steam water from the lower vessel to the upper vessel, then the liquid flows and descends from the upper vessel to the lower vessel by means of air pressure.

By air pressure from top to bottom
When the heat stops, the coffee descends into the empty vessel.