Scientists have proved that a foamy coffee is best for commuters as the froth makes the drink much harder to spill
You wouldn’t have thought it would take a team of physicists to work out that foamy liquids are less sloshy than those lacking in the bubble department but hey, they have.
Let’s face it, there’s nothing worse than being half asleep and trying to navigate public transport or office stairs with a coffee in hand that’s sloshing around inside the cup, spilling over the sides, and burning your fingers.
Never fear, coffee aficionados, because your caffeine solution is here.
Scientists have found that just a few layers of bubbles or foam on a drink can significantly dampen the motion of the liquid and prevent it from spilling.
What does this mean for your morning fix? Change your order to a latte or cappuccino.
Professor Emillie Dressaire, from New York University Polytechnic School of Engineering, built a narrow rectangular container made of glass and filled it with a solution of water, glycerol and a dishwashing detergent to test the damping power of foam.
By injecting air at a constant flow rate through a needle at the bottom of the rectangular cell, they created uniform layers of bubbles. The researchers then experimented with two types of movements: jolting the apparatus with a quick, side-to-side motion and rocking it steadily back and forth.
Recording the resulting waves with a high-speed camera, they found that just five layers of foam were enough to decrease the height of the waves by a factor of 10.
In short: goodbye cortado.
Want to know more? Check out this video Professor Dressaire and her team made: