Do you really know the difference between drip coffee and hand brewed coffee?

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Water seeps through the ground coffee, the paper filter, and is then collected in a container placed below a holder used for drip brewing.

Drip coffee (Drip brewing) is a way to pour hot water into roasted and ground coffee beans to brew coffee. The water seeps through the ground coffee, absorbs its tar and aroma, and flows through gravity to the bottom of the filter. Brewed coffee grounds are left in the filter as drops of water fall into things such as glass bottles or coffee pots.

A coffee shop in Bangkok that specialises in drip brew coffee

Electric drip coffee machine.

Coffee filter paper was invented by Melitta Bentz in Germany in 1908 and is widely used in dripping coffee. In 1954, a machine called Wigomat, invented by Gottlob Widmann, was the first patented electric drip coffee in Germany. Drip coffee pots replace the coffee filters of the 1970s because coffee filters are overpermeable and brewed coffee is often too bitter [3]. One of the benefits of coffee filter paper is that the remaining coffee grounds and filter paper can be disposed of together without the need to clean the filter. Permanent filters are also common these days, made up of thin metal sheets and a thin plastic mesh, which can stop the powder from passing through and only let the coffee through, because sometimes there is no way to buy a special filter everywhere. So the invention of permanent filter solved this problem. Although this will increase the frequency of machine maintenance, it will reduce the overall cost and reduce more waste.

Due to the popularity of family coffee machines, especially in North America, drip coffee brewing has become more popular [4]. However, a variety of hand-dripping coffee machines on the market provide more room for parameter adjustment than fully automatic coffee machines, and combine innovative technologies such as stop valves to better control brewing time and the ratio of coffee to water. There is also a smaller, more convenient filter that hangs only on the mouth of a mug or coffee cup. Pour in hot water and drop directly into the cup.

Coffee brewed with filter paper tastes pure and fragrant. Although unwanted deposits are removed, the oil flowers and aroma of coffee are lost; they are filtered by filter paper [5]. Metal filters do not filter out these ingredients [6].

This is very obvious, especially when using a high and narrow coffee pot, the coffee at the bottom of the coffee pot is more intense than the coffee at the top. This is because as the coffee is brewed, less flavor is extracted from the ground coffee. Some studies have put forward the mathematical theory that when the two cups are poured with the same force, the flow of liquid will follow the Su-Morse series [7], and the analysis results are published as interesting news in the mass media [8].

A less familiar form of drip brewing is the reversible or "flip" pot commonly known as Napoletana.