QUIT TIME!
Sugar cubes in Lake Constance

Air purity classes define the maximum permissible particle concentration per cubic metre of air in a cleanroom. The higher the purity class, the cleaner the cleanroom – so far, so good.

Now let’s assume that Lake Constance is a cleanroom. And in our Lake Constance cleanroom, there are a few particles floating around in the form of sugar cubes.

Question: How many sugar cubes in Lake Constance correspond to the maximum particle concentration of air purity class A / B / ISO 5?

((You can find the answer below))

Incidentally, modern water analysis is so sensitive today that it could detect even a single sugar cube in Lake Constance. But that’s just by the way!

Published: June 2025

Answer: 100 pieces