Coffee and Espresso Machines Espresso machines use pressure to force water into finely ground and tamped beans. They produce a rich and delicious cup of coffee. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to get the most efficient extraction. Beware https://www-coffeee-uk10221.bloggerswise.com/36475224/how-to-design-and-create-successful-coffee-machines-espresso-instructions-for-homeschoolers-from-home