Demonstration of the exponential decay law using beer froth

Abstract

The volume of beer froth decays exponentially with time. Thisproperty is used to demonstrate the exponential decay law in theclassroom. The decay constant depends on the type of beerand can be used to differentiate between different beers. Theanalysis shows in a transparent way the techniques of dataanalysis commonly used in science - consistency checks oftheoretical models with the data, parameter estimation anddetermination of confidence intervals.