Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They create a rich and delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to ensure the highest extraction. https://coffeee-uk12402.digiblogbox.com/55082143/learn-about-coffee-machines-espresso-while-you-work-from-at-home