Piezotransducer? As in the little thing that makes electronics beep and buzz?
this post was submitted on 16 Jun 2026
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dart board;; science bs
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Doesn't count until James Hoffman reviews it.
Researchers at UNSW Sydney have harnessed the power of ultrasonic sound waves to make espresso-strength coffee with room temperature water, cutting energy use by up to 75%.
You got 19 upvotes (as I see it) for having repeated word for word (or copy-pasted) what they say in the subtitle. An interesting phenomenon in itself.
Yes. He gave us the missing information from the clickbait-title. In this way he was making the subtitle here available, and i didn't needed to click a link to a random website too read it.
In the end i was was clicking the link because the subtitle sounded interesting. With just the title i probably would not read it. And then i controlled if he cited it correctly. And because it was the same i gave an upvote to confirm to others that the subtitle is correct
Users on social media apps tend to avoid leaving the app to read articles. Reading comprehension in the comments is always highest in the comment chain of the most complete copy-paste of the article.
Why the fuck would I want a room-temp espresso?
"Although the researchers say their new system could be relatively easily developed into an automatic coffee machine for home users, the biggest opportunity is likely to be for large-scale commercial producers of coffee-based drink."
They say it in the article what it is for...
When hot days and you need to wait for it to cool down and add ice. All those Starbucks frappucinos with this tech will save the world.
Hot day? What's that?
It’s like a hot dog.
Cold brew
I wonder if this method produces less acidic coffee, like cold brewing does?
while ultrasound can do some weird things, article says
Their research, published in the Journal of Food Engineering, included blind taste-testing experiments which showed that their ultrasonic room-temperature version of espresso was undistinguishable from coffee shots brewed in the traditional way.
Except cold... Why would someone drink a cold expresso? It just seems kinda gross, then again, I'm not a fan of putting cheese in my coffee either (different strokes for different folks I guess).
Espresso is often served over an ice cube in Spain, and it’s fuckin great, to use the technical term. If it’s hot, I’m all for the cold and tasty
At that point I would think it's more of an americano (espresso and hot water) that's been mishandled, but that's just my opinion. I've never been a fan of cold coffee though I always end up drinking some before I'm done in the morning.
Fancy Cold brewing = oily coffee diarrhea
“Cold brewing concentrates the essential oils…” “This single shot of espresso is equal to 3 shots or something stupid…”
So you take whatever is good and end up shitting out liquid coal…
I'm sorry your tummy can't handle a few coffee oils. I understand why you wouldn't want to drink them.
looks at my 4 shot cup of mocha
"I could go for 6..."
The main purpose of drinking coffee daily is for having regular poop. So it all works out.
Checks out
Not sure how I feel about this. There is no real logic to my resistance on the idea, but I have some.
I don't really get it to be honest. It's pretty pointless if you don't want room temperature coffee, or no.
They're talking about commercial scale coffee products and coffee flavoured products (bottled coffee drinks, instant coffee, etc.), where a reduction of 75% of the energy consumption could not only be very profitable, but also helpful in hitting environmental targets. Coffee is already a bit of an environmental nightmare when it comes to water usage in farming, so lessening the impact of commercial coffee is definitely a plus.
if all that energy is used to boil water and we're cutting that energy use by 3/4 then it's saving 70Wh (not kWh) per litre, or 70kWh per cubic meter. that's not much
When you're dealing with thousands of litres per hour, it's a fair amount.
Perfect for iced coffee though
Better. Perfect would be using chilled water. I'm on a limited connection right now so I can't investigate, but I'm curious to know if they tested.
probably can be done, but ultrasound irradiation itself will warm up coffee a little. if all of it goes to heat, then it's extra 20C or so so you'll have to cool it down afterwards anyway
You can heat the water afterwards. A lot of the heat in the hot water is lost in the beans. This might never have an application at your local coffee shop, but for canned coffee it will make a dramatic difference in profitability.
A coffee shop is still going to have a regular espresso machine running all the time.
Did you use reading comprehension as a dump stat? You just used different words to say what I said.
Finally
/s