Coffee and Espresso Machines Espresso machines make use of pressure in order to force water into finely ground and tamped 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. https://coffeee36551.jiliblog.com/87080159/how-to-create-successful-coffee-machines-espresso-techniques-from-home