Coffee and Espresso Machines Espresso machines make use of pressure to push 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-uk40903.mdkblog.com/35474369/20-fun-facts-about-espresso-machine