Get all your news in one place.
100's of premium titles.
One app.
Start reading
The Conversation
The Conversation
Francisco Trujillo, Senior Lecturer, School of Chemical Engineering, UNSW Sydney

I used sound waves to make espresso. It could cut coffee-brewing energy use by 75%

Richard Freeman / UNSW

Most of us think of espresso as a hot, high-pressure ritual. Finely ground coffee goes into a machine, boiling water is forced through it, and in about 30 seconds we get a concentrated shot with crema, aroma, bitterness, body and caffeine.

As someone from Colombia, I like to think coffee is in my blood – and I’m proud to come from a country known for producing some of the best coffee beans in the world.

Sign up to read this article
Read news from 100's of titles, curated specifically for you.
Already a member? Sign in here
Related Stories
Top stories on inkl right now
One subscription that gives you access to news from hundreds of sites
Already a member? Sign in here
Our Picks
Fourteen days free
Download the app
One app. One membership.
100+ trusted global sources.