Coffee and Espresso Machines Espresso machines make use of pressure to force water through finely ground and tamped coffee beans. They make a rich, tasty brew. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars in order to achieve optimal extraction. Beware https://coffeee-uk07504.eedblog.com/29853389/from-around-the-web-from-the-web-20-awesome-infographics-about-espresso-machine