You might think that you have very little in common with professional physicists – even the space-loving among you. But one ...

More information: Pour-over coffee: Mixing by a water jet impinging on a granular bed with avalanche dynamics, Physics of Fluids (2025). DOI: 10.1063/5.0257924 Provided by American Institute of ...

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Arnold Mathijssen, a physicist at the University of Pennsylvania, is partial to pour-over coffee, which involves manually pouring hot water over ground beans and filtering it into a pot or mug below.

Pour the boiling water over the ground coffee slowly so the water has more time to be in contact with the grounds. The longer the pour time, the greater the extraction.

It involves hand-pouring hot water over coffee grounds in a filtered cup. A hole at the bottom of the device allows the liquid coffee to drip into a mug waiting below.

Pour-over coffee is made by flowing a strong, laminar water jet through a bed of ground coffee beans. Jennifer Ouellette – Apr 8, 2025 4:14 pm | 147 Credit: Ernest Park ...

Pour the boiling water over the ground coffee slowly so the water has more time to be in contact with the grounds. The longer the pour time, the greater the extraction.

Pour the boiling water over the ground coffee slowly so the water has more time to be in contact with the grounds. The longer the pour time, the greater the extraction.

The researchers’ coffee equipment and coffee experiment notebook. Credit: Arnold Mathijssen, et al. “If you have a thin jet, then it tends to break up into droplets.

Researchers have worked to optimize the use of coffee grounds in pour-over coffee. They recommend pouring from as high as possible while still maintaining the water's flow. In particular, the ...