Coffee and Espresso Machines Espresso machines make use of pressure to push water through finely ground and tamped coffee beans. They create a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars to ensure the highest extraction. Beware https://www-coffeee-uk48660.answerblogs.com/29961452/how-to-explain-espresso-machine-to-your-mom