The term loading has a wide variety of specialized meanings in various fields of science. In general, all refer to the addition of something to a system, just as loading a truck means filling it with objects. In the science of acoustics, for example, loading refers to the process of adding materials to a speaker in order to improve its acoustical qualities. In environmental science, loading is used to describe the contribution made to any system by some component. One might analyze, for example, how an increase in chlorofluorocarbon (CFC) loading in the stratosphere might affect the concentration of ozone there.