The Sound Of Coffee

Friday, July 10, 2015

Do you ever find that a good coffee just seems to sing to you?

Well, you’re not the only one, and you’re certainly not imagining it!

Indeed, there’s more to coffee than meets the eye, it’s not just about caffeine, silky aromas, delicious taste sensations and latte art.

Yes, when you pour that magical cuppa, numerous chemical reactions are taking place behind the scenes, and it’s simple physics at play behind the ‘sound of coffee’.


Sound Waves and Coffee

When you stir a coffee – let’s say in this case a Vienna Coffee, for example - the creamy layer separates back out, and you will hear a ‘tapping’ sound from the liquid which will get higher and higher in pitch.

This is caused by the fact that sound travels at different speeds in both liquids and gas.

The speed of sound is higher in water than it is in air as the water molecules are much closer together.

The shock waves that create sound travel faster through close-packed molecules, so sound is faster in liquid coffee than in froth, and faster sound waves have a higher pitch.

Thus, when you mix froth and liquid — for instance, by stirring whipped cream through a coffee — you affect the speed of sound in the drink.

So, by introducing air bubbles which slow the speed of sound, you get a lower pitch noise from your cup of coffee.

But after stirring, the cream separates out and rises up.

When you keep tapping the bottom of the cup, there is less and less gassy whipped cream down low, so the sound can move more and more quickly, and the pitch rises.

So you can hear that crescendo of increasing pitch as you just tap the bottom and let the foam rise to the top.

You can hear the opposite happen next time your barista is frothing milk with an espresso machine – that is, an initial squealing sound.

However, as the milk gets whipped into a warm froth, the pitch will drop lower and lower.

Over to you

Does your Cafe2U coffee sing to you?

Do you know any other amazing scientific facts about coffee?

As always, get in touch with us here at the Cafe2U blog with your comments and questions – we love hearing what you guys have to say!

Famous Coffee Quotes… Continued

Tuesday, June 30, 2015

In a previous blog post, we brought you a collection of coffee quotes – some famous, some not so famous.

We enjoyed scouring the internet so much for these pearls of wisdom that we decided to compile some more for a follow-up post.

Enjoy – and let us know if there any more quotes that we should add to the list!

Coffee quotes

“Coffee is a language in itself.”

- Jackie Chan

"Coffee is the common man’s gold, and like gold, it brings to every person the feeling of luxury and nobility."

- Sheik Abd-al-Kadir


"Ah! How sweet coffee tastes! Lovelier than a thousand kisses, sweeter far than muscatel wine!"

- Coffee Cantata, J.S. Bach

"Good communication is just as stimulating as black coffee, and just as hard to sleep after."

- Anne Morrow Lindbergh

"We want to do a lot of stuff; we're not in great shape. We didn't get a good night's sleep. We're a little depressed. Coffee solves all these problems in one delightful little cup."

- Jerry Seinfeld

"If it wasn't for the coffee, I'd have no identifiable personality whatsover."

-David Letterman

"Even a bad cup of coffee is better than no coffee at all."

- David Lynch

"Suave molecules of Mocha stir up your blood, without causing excess heat; the organ of thought receives from it a feeling of sympathy; work becomes easier and you will sit down without distress to your principal repast which will restore your body and afford you a calm, delicious night."

- Prince Tallyrand

"The powers of a man’s mind are directly proportioned to the quantity of coffee he drinks."

- Sir James Mackintosh

"I could smell myself awake with that coffee."

- Jaesse Tyler

"The voodoo priest and all his powders were as nothing compared to espresso, cappuccino, and mocha, which are stronger than all the religions of the world combined, and perhaps stronger than the human soul itself."

- Mark Helprin, Memoir from Antproof Case, 1995

Dialogue between Nancy Astor and Sir Winston Churchill:

Nancy Astor: “If I were your wife, I would put poison in your coffee.”

Sir Winston Churchill: “And if I were your husband, I would drink it.”

Over to you

What do you think of these coffee quotations – do you have a favourite?

Are there any more coffee quotations that you’d like to add to this list?  

As always, remember to get in touch with us here at Cafe2U – we love hearing from our readers!

Surprising Coffee Facts

Monday, June 29, 2015

Chances are, if you’re a regular reader of our coffee blog – or even if this is your first time here – then you will fancy yourself as somewhat of a coffee connoisseur.

However, the following list of surprising coffee facts might… well… surprise you!

So, make yourself comfortable, pour yourself a piping hot brew (naturally), and take five minutes out of your hectic day (you’ve earned it) to enjoy this collection of eye-opening coffee information…



Coffee is the world’s second most traded commodity, second only to crude oil.

It is also one of the world’s very oldest commodities too.


The world’s very first webcam was created because of… you guessed it, coffee!

In 1991, scientists from Cambridge University created a basic webcam so that they could monitor their coffee pot from the comfort of their own desks.

Coffee Balls

When the effects of caffeine were first discovered, coffee was not enjoyed as a beverage.

Originally, coffee beans were ground up along with animal fat to make small “energy balls”.

It wasn't until the 14th century that roasting coffee beans became commonplace.


For the average human being, the caffeine in coffee takes between 30 and 60 minutes to reach peak levels in the bloodstream.

However, according to the results of one study, this time could sometimes be as little as 10 minutes.


Scientists have shown that to get the most out of coffee you need to drink it between the hours of 9:30am and 11:30am.

This is because during this window your body’s cortisol levels are at their lowest.

Cortisol is the hormone that makes you feel alert and when those levels drop, it's the best time for coffee; conversely, drinking coffee when cortisol levels are high creates a tolerance to the drink, requiring you to drink larger quantities and stronger varieties.


Although it may sound counter-intuitive, dark roast coffee actually has less caffeine than lighter roasts.

This is because the process of roasting to a richer and stronger flavour burns away some of the caffeine.

Over to you

So, you may already know, like most of us, that coffee perks you up, tastes delicious, and leaves your breath somewhat unsavoury… but did you already know any of these coffee facts?

Are there any other eye-opening coffee facts that you feel we should add to this list?

As always, remember to get in touch with us here at the Cafe2U Blog, as we love hearing what our readers and customers have to say!