What is the standard of Italian coffee powder?

How much coffee powder is used in espresso coffee

Although this golden rule has been controversial in professional coffee forums in recent years, the 9bar pressure is basically not controversial, so a bunch of boasting 15bar or even higher coffee machines on a treasure actually refers to the highest pressure of coffee machines, which is of little significance in itself, and is generally used to fool newcomers. Stable pressure and stable temperature are the standards for measuring espresso machines.

Now that you understand the two most important factors of espresso, you can choose an espresso machine, and all traditional espresso machines are designed around these two factors.

In the coffee machine, the pressure value is mainly affected by the pump, the pump is divided into vibration pump and rotary pump, the pressure curve of the vibration pump fluctuates, and the pressure curve of the rotary pump tends to be a straight line. Unfortunately, the rotary pump machine is currently not below 8000.

How to make coffee without a coffee pot? First, you can add 250 ml of water to the pot, heat it to boiling,(preferably a small mouth or cup); then pour 50cc of water into the coffee cup to warm it (There is no special measuring cup at home to feel it), pour two spoonfuls of coffee powder into the pot (In general, the weight of a spoonful of coffee powder in a coffee shop is 13 grams, and two spoonfuls are 25 or 6 grams.), while pouring, stir, generally clockwise two to three rounds, stir more coffee will become sour, and then boil for about 60 seconds. Secondly, pour the hot water in the coffee cup, put the filter cloth on the cup, and slightly lower the center position of the filter cloth on the cup. In this way, the coffee solution will not spill out. Pour it slowly.

The influence of temperature values in Italian coffee machines is mainly the size of boilers or heating blocks, as well as good heat conduction materials, toy machines and professional Italian coffee machines have obvious differences here. Most toy machines are equipped with small boilers (below 200ml) or small heating blocks, which is difficult to achieve stable temperatures, and the temperature fluctuates greatly during the coffee extraction process. Many small household appliance brands are like this (such as Cankun, Delong, Electrolux, etc.), these brands are not professional coffee machines after all. There is also a good heat conduction material to consider, a good machine line pipe design is better, the use of copper or stainless steel as the main material of the coffee machine, they have good thermal conductivity (to ensure uniform temperature stability), otherwise from the boiler out or 90 degrees, to the coffee machine water becomes seventy or eighty degrees, in the low temperature environment will be more obvious