Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They produce a rich and delicious cup of coffee. Good Housekeeping Institute experts recommend models that are brewed at a minimum of 9 bars to ensure the best extraction. https://coffeee-uk40903.mdkblog.com/35473574/what-coffee-machines-espresso-experts-want-you-to-learn