appliance

Ultrasonic espresso machine brews coffee without heat using sound waves, cutting energy by 75%

Researchers at the School of Chemical Engineering in Sydney have created an espresso machine that uses ultrasound instead of heat, brewing coffee in under three minutes at room temperature with 75% less energy. In blind taste tests, 100 coffee drinkers could not distinguish the ultrasonic espresso from traditional hot-brewed espresso. The technology could find applications in home machines, cafes, and ready-to-drink coffee products.