1g of powder is mixed with 14~17ml of water, that is, about 1:15. After grinding, the cell wall of coffee beans will completely disintegrate, and the contact area with air will increase a lot, and the speed of oxidation and deterioration will become faster. Coffee will lose its flavor within 3 seconds to 2 minutes. Therefore, it is recommended not to buy coffee powder, but to buy coffee beans, which should be ground before drinking, and then brewed as soon as possible.

before the invention of the bean mill, people used stone pestles and bowls to grind coffee beans. A doctor abroad once experimented with this ancient tool and compared it with the modern bean grinder. It is said that the coffee powder ground with a pestle and a stone bowl is the most fragrant. Extended information

Coffee beans are roasted, and there are many kinds of roasting. After roasting, they are ground into powder and can be directly brewed or boiled. Coffee originated in Ethiopia. Before it was introduced to Europe in the 17th century, it was used as a beverage in North Africa and West Asia for hundreds of years.

All the hot and humid areas in the world have opened up coffee plantations, and coffee has become a popular drink. But it takes a lot of effort to make a pot of delicious coffee. Coffee beans must be ground into fine powder, and it is best to use some kind of filter to leave coffee grounds outside the cup. There are also many places where people like to drink unfiltered coffee.

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