Exponential graphs are important in several aspects of science for example in expanding populations, in the charge and discharge of capacitors and in radioactive decay. At first site an exponential relation between two quatities is hard to understand but there are some quite simple things which have that, for example, if a bucket has a hole in the bottom through which the water drains out the level of the water will have an exponential relationship to time.

The video aims to show this in more detail.

Exponential change