Study proves: This is how you pour the perfect cup of filter coffee

Coffee powder has recently become more and more expensive – so it is high time to deal as economically as possible. How to get a strong drink from as little powder as possible with hand -brewed filter coffee, physicists have explored. Your tip: pour the water from a great height in a consistent beam onto the powder.

First a coffee and then the world – that’s how countless people start the day. According to the German coffee association, filter coffee is the most popular way to enjoy coffee- prepared with a machine or manually with a porcelain or plastic filter, designed with special filter paper.

Trend towards pour-over coffee

In the so-called pour-over coffee, hot water is poured into such a filter slowly and circularly via freshly ground coffee powder. This regionally used type of preparation has been more popular for some time.

The researchers in the journal « Physics of Fluids » explain ideal for the pour-over process in the pour-over procedure in order to achieve the necessary height and type of flow. The pouring of this kettle is reminiscent of the shape of a swan neck and should enable as precisely as possible.

A strong, concentrated water jet therefore creates a kind of avalanche in a coffee powder: the repressed powder circulates while the water digs deeper into the coffee bed. This leads to a stronger mix of water and coffee flour – and thus to a stronger coffee.

« If the water jet is too thin, it tends to crumble into droplets, » said co -author Margot Young from the University of Pennsylvania. He could not effectively mix the coffee flour with the hot water.

The kitchen as a research laboratory

In addition to real coffee powder, the team also used laser -laser -lasered particles in a glass funnel to be able to track and analyze the mixed dynamics. In general, you could have a lot of physical and chemical learning in the kitchen, co -author Arnold Mathijssen from the University of Pennsylvania pointed out. « It leads to new scientific findings where you didn’t expect them. »

Billion kilograms of coffee annually

Coffee trade is a billion dollar business and an important source of income for many countries worldwide. Every year, several billion kilograms of coffee are consumed worldwide, as the US roof association of physical specialist societies AIP explains. The progressive climate change threatens the cultivation. Among other things, suitable construction areas are lost, extreme weather events cause crop failures. At the same time, global demand increases, for example in Asia. In recent years, coffee has already become significantly more expensive.

Nice detail on the side: In the days of Frederick the Great (1712-1786) there were so-called coffee sniffers in Prussia. Only state roasters were allowed to roast the profitable coffee at that time, as the coffee association explains. The state coffee sniffers should track down people based on the characteristic smell who beans beans themselves forbidden.