Coffee and Espresso Machines Espresso machines make use of pressure in order to push water into finely roasted and tamped beans. They produce a rich, delicious cup. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to get the most efficient extraction. https://coffeee78434.webdesign96.com/30285596/15-terms-everybody-within-the-espresso-machine-industry-should-know