Five major brewing factors of espresso Espresso

The scientific definition of Italian concentration is as follows: coffee bean powder 6.50.5g, brewing water temperature 905℃, brewing water pressure 92bar, brewing time 305s. When we brew espresso, we must take the scientific definition as the basis, but because there are too many factors to pay attention to when brewing a cup of espresso, there are more than 20 different factors. Here we will