Density of bubbles

Post date: Apr 27, 2012 2:52:47 PM

As seen in this picture, the (apparent) density of bubbles decreases with elevation.

The picture is taken from here , but I observe the same all the time.

Here is the most recent pic (original and digitally enhanced contrast, using HDR-ish in Picasa)

An this is the bottom of the same container (digitally improved contrast):

Challenge: Can we explain this distribution?