page 7 - As a general rule in physics, whenever a phenomenon is characterized by a small dimensionless number, there is a good chance that a simple description exists.
- page 7 - As a general rule in physics, whenever a phenomenon is characterized by a small dimensionless number, there is a good chance that a simple description exists.
## [the ratio of molecular diffusion to dynamic viscosity](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5425/dyre%2Bglass.pdf)
