Coffee and Espresso Machines Espresso machines make use of pressure in order to push water into finely roasted and tamped beans. They produce a rich, flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to achieve optimal extraction. https://coffeee44494.frewwebs.com/30350779/espresso-machine-explained-in-fewer-than-140-characters