A small class experiment

How to check the quality of your coffee blend

The density of ground coffee is lower than the density of water. That's why ground coffee floats in water.

If you want to check the quality of your beloved coffee blend, you can try this little experiment that we carried out yesterday in our Science class.

You can put a spoon of ground coffee in a bowl full of water. 

If part of the coffee powder sinks down into the bowl, it means that the coffee blend contains some kind of coffee surrogate, such as barley, or if it is of lower quality, roast broad bean powder.

Photographs: Niccolò - 2^A - Scuola Secondaria di primo grado Torano Nuovo