Coffee and Espresso Machines Espresso machines use pressure to force water into finely ground and tamped beans. They create a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to get the most efficient extraction. Beware https://coffeeeuk06401.imblogs.net/79581798/this-is-the-good-and-bad-about-coffee-machines-espresso