I used sound waves to make espresso. It could cut coffee‑brewing energy use by ¾

Re:I used sound waves to make espresso. It could cut coffee‑... by stevage on Friday June 19, 2026 @09:32PM (#48605394)

> And most iced coffee is very intentionally not made with espresso

Really? How is it made?

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Re:I used sound waves to make espresso. It could cut coffee‑... by PoorlyNamed on Friday June 19, 2026 @09:41PM (#48605448)

By soaking regular ground coffee in water for 12 hours or so.

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Re:I used sound waves to make espresso. It could cut coffee‑... by tasercake on Friday June 19, 2026 @10:47PM (#48605869)

You may be thinking of cold brew, which is usually more expensive due to the higher coffee-to-water ratio. A standard ‘iced coffee’ at most coffee shops is espresso-based

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Re:I used sound waves to make espresso. It could cut coffee‑... by PoorlyNamed on Friday June 19, 2026 @11:26PM (#48606079)

Huh. I never drink cold coffee so I always assumed they were one and the same. Thanks for the correction.

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Re:I used sound waves to make espresso. It could cut coffee‑... by crazygringo on Saturday June 20, 2026 @11:07PM (#48615306)

This is not true.

A standard iced coffee is just regular brewed coffee that is then put in the fridge. (Which is different from cold brew which is brewed in the fridge.)

Absolutely not espresso-based.

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Re:I used sound waves to make espresso. It could cut coffee‑... by crazygringo on Saturday June 20, 2026 @11:10PM (#48615327)

By making regular hot brew coffee and putting it in the fridge.

If you go to any random cafe and asked for an iced coffee, that's what they're going to give you.

If you want something else, you have to ask specifically for cold brew, or a specialty drink like an iced latte or something.

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