As I was browsing on the web, I came across a website of the mysterious physics of 7 everyday things. What cuaght my eye was "Foam". According to Douglas Durian, a professor of physics at UCLA, foams are typically 95 percent gas and 5 percent liquid. Somehow these add up to give them, certian traits of solids, too. The gas in the foams seperates the liquid to form a matrix of tiny bubbles.No formula exists for predicting exactly how stif or oozy a foam wil be based on the size of its bubbles or the amount of bubbles it contains. Its interesting to me how the physics of foam is poorly understood.
Http://www.livescience.com/33537-mysterious-physics-everyday-things.html
Stephanie Pena