Javier Carbajal
Gear

Scientists Invent a Way to Brew Espresso With Ultrasonic Waves—No Hot Water Required

Researchers have demonstrated they can make coffee comparable to conventional espresso using ultrasonic waves. Because the process doesn’t need hot water, it consumes 75 percent less energy.
caf espresso
Photograph: Guido Mieth/Getty Images

What do you need to make a good espresso? Ground coffee, of course; a machine capable of generating pressure; and hot water, preferably heated to between 195 and 205 degrees Fahrenheit. And that’s it. But could one perhaps do without that last element? No, not the water itself, but the need to heat it.

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