An energy-efficient espresso is made without heat and 75% less energy. Ultrasonic sound waves are applied to turn room temperature water and coffee grounds into a quality espresso shot that equals a conventional brew.www.unsw.edu.au/newsroom/news/2026/06/New-way-making-espresso
www.unsw.edu.au/newsroom/news/2026/06/New-way-making-espresso