首先，我们需要烧水20分钟左右，因为是小酒精灯。其次，水由于加热变为水

First, we need to boil water for about 20 minutes, because it is a small alcohol lamp. Secondly, the water turns into water vapor due to heating, and the water vapor gradually soaks the coffee powder through the perforated lid. The water vapor generates increasing pressure in the closed container, pushing water from the tube into the upper cup, which will last for a while. We remove the heat source, and the water in the upper cup (that is, the prepared coffee) will also fall back into the round bottom beaker through the tube. This is because the heat source is removed and the water is no longer boiled, so no steam is produced, and the steam is reduced. Cooling means that the internal pressure of the water beaker decreases. When the water vapor pressure is no longer greater than the mass of water, the water will fall. And this method of "making coffee" is very high-end, purer and more expensive.

First of all, we need to boil water for about 20 minutes, because it's a small alcohol lamp. Second, the water changes to water vapor due to heating, which gradually soaks the coffee powder through the perforated lid. Water vapor creates increasing pressure in an airtight container, pushing water from the pipe into the upper cup, which will last for some time. We remove the heat source, the water in the upper cup (i.e. made coffee) will also pass through the tube back into the round bottom beneber, because the heat source is removed water is no longer boiled so do not produce water vapor, water vapor reduces cooling for the internal pressure of the water berrige reduced, when the water vapor pressure is no longer greater than the quality of water, the water will fall. And this "coffee-making" method is very high-end, purer and more expensive.

First of all, we need to boil water for about 20 minutes, because it's a small alcohol lamp. Secondly, water changes into steam due to heating, and the water vapor gradually soaks coffee powder through the perforated cover. The increasing pressure of water vapor in a closed container will push water from the pipe into the upper cup, which will last for a period of time. When we remove the heat source, the water in the upper cup (that is, the prepared coffee) will also fall back into the round bottom beaker through the pipe. This is because the heat source is removed and the water is no longer boiled, so no steam is generated. When the water vapor pressure is no longer greater than the mass of water, the water will fall. And this method of "making coffee" is very high-end, purer and more expensive.<br>