1.   E indicates the distribution of energy over different length scales.

2.   An eddy is localized -- its extent is indicated by its length scale.

3.   The action of viscosity is slight on a length scale of the mean flow.

4.   The process continues until the length scale is small enough for viscous action to be important and dissipation to occur.

5.   This process is analogous to the cascade because it involves the appearance of smaller and smaller length scales until this is limited by molecular effects.

6.   The irregular and changing corrugations occur with a wide range of length scales.

7.   However, L can be used as a length scale in the analysis of the changes due to stratification.

8.   The Nusselt number has a particularly simple and useful interpretation when the length scale is the thickness d of a layer with temperature difference across it.

9.   We have seen in various places in this book that flows often develop length scales quite different from the imposed ones.