Scaling & self-similarity. 

Topology, size and other distributions to describe what's going on.

What does transient look like as function of initial polydispersity?

Intuition suggests a self-similar structure will be reached. Will this be 
distinct from other structural change processes?

What rule of non-equilibrium statistical mechanics can be used to describe 
these scaling states?

There is evidence of self-similarity in foams from ESRF experiments. After 
a transient, the size distributions are stable and robust. Seen when 
average bubble size is several times the initial bubble size.

Why should scaling be expected? Not intuitive to everyone. 

Are there similarities between glasses and foams?

Mixtures of high and low diffusivity gases. The development will be 
dominated by the transport of more diffusive gas in first instance. 
Expected that self-similar states will still be reached. What is a better 
discriminant for self-similarity that's better than energy per volume.

How does a bubble disappearing affect the self-similarity?