Solved cryptogram
A mole counts particles rather than weighing them, and the count it names never changes.
Physics Facts, sourced to NIST.
What it means
Chemists needed a way to talk about huge numbers of atoms without writing out the zeros, so they gave one particular huge number a name. A mole of anything is the same count of things, whether those things are atoms of gold or molecules of water. The unit used to be tied to a mass of carbon; it is now simply the number itself, which makes it a pure counting unit like a dozen.
The claim comes from NIST, and the page it comes from was read on 2026-08-27 to confirm it still says this.
This is not the kind of claim that goes out of date, which is why it was set as a puzzle rather than a fact with a shelf life.
Solve it yourself
This fact is a cryptogram here: 72 letters over 18 different ones, graded medium.
- SourceNIST
- CollectionPhysics Facts
- Difficultymedium
- Length72 letters, 18 of them different
Nearby in the collection
The facts either side of this one.
About as hard as this one
Scored closest to it by the model behind our guide to solving cryptograms.