The Secret Science of Coffee

When you drink coffee, you do so for the caffeine, the flavor, or the ritual, but did you know there was a whole scientific process behind every cup? Coffee isn’t just a beverage: it’s a temperature-, pressure-, time- and physics-dependent chemical process.

First, there’s extraction. When water flows through ground coffee, it extracts hundreds of chemicals: acids, sugars, oils, and flavor compounds. The proportions of these chemicals define the flavor of the coffee. If the extraction happens too quickly, the coffee tastes sour and weak. If it takes too long, it tastes bitter. Getting the timing just right is what we mean by dialing in.

There’s the temperature. Every degree or two makes a difference to the flavor. Higher temperatures extract more, and faster. Lower temperatures extract less. That’s why commercial coffee machines are so highly regulated.

There’s the pressure. In a commercial espresso machine, pressure is what forces the water through the grounds to create a concentrated beverage with a heavy body and crema. Without the right pressure, the shot tastes funny and unpredictable.

Even the grind size is a variable to control. The finer the grounds, the slower the water flows, and the more it extracts. The coarser the grounds, the faster the water flows, and the less it extracts. That’s why baristas have to adjust the grinder throughout the day. Beans swell a bit when it’s humid, shrink when it’s cold, and even change over time since roasting.

At BrewSkillArt, we don’t approach coffee as a matter of trial and error. We approach it as a system. Once you understand the variables controlling the extraction process, you can adjust accordingly. You don’t “attempt” to make good coffee: you just make it.

Coffee may look like a simple beverage in a cup, but it’s a finely-balanced scientific process. Once you see that balance, you can never go back.