What is espresso? Single and double espresso differentiates under different pressures?

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In recent years, high pressure extraction coffee and variable pressure extraction are very popular.

Nine bar can no longer satisfy the barista's pursuit.

They began to hope to chase perfect coffee by changing the pressure of atmospheric pressure.

Baristas are a bunch of perfectionists.

Keep innovating and pursuing

Let's first understand what is espresso?

Espresso refers to all modified coffee drinks based on Espresso/ espresso made by espresso machines. For example, we usually drink kabu, latte, mocha and American style, which are all coffee drinks made by adding milk or water to Espresso.

1shot: espresso 30ml

Capptccino: 1: 3: 2

Latte: 1: 4: 1

Macchiato: 1 shot espresso + 1 spoonful of milk foam

American 1 shot espresso + hot water

Refers to a single espresso Espresso Solo. "Solo" is Italian, equivalent to the English meaning of "single", indicating the weight of Espresso. In addition, in Italy, "Espress o" is generally referred to as drinking it, or drinking it all at once.

2 cups of double espresso Espresso Doppio

Concentrated into half an extra-strong espresso Espresso Ristretto

Extract light espresso Espresso Lungo with a lighter flavor

What's the pressure?

The pressure is measured on the basis of the barometer, that is, the pressure applied by the atmosphere. It can basically be understood as the weight of the atmosphere at sea level.

Espresso is usually extracted at nine atmospheric pressures (nine bar), or nine times the weight of the atmosphere at sea level. "espresso has a long history, and nine bar is the best tested pressure."

Now baristas try to pursue a more perfect espresso by adjusting the atmospheric pressure. The coffee at 12 bar can be extracted faster and the flavor can be better released, but if the extraction time is too long, it is easy to over-extract.

Then many coffee machine developers find ways to help baristas solve this problem, and then there is the emergence of segmented pressure swing extraction. Difference between single and double espresso

For example, when a coffee machine is extracting a cup of espresso for 30 seconds, the first 10 seconds is 9 bar, the next 10 seconds is 12 bar, and the last 10 seconds is 7 bar. In this way, the over-extraction of the tail segment can avoid affecting the flavor as much as possible. Difference between single and double espresso

Of course, baristas will also adjust the parameters according to different Italian coffee beans to pursue the perfect extraction. Difference between single and double espresso

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