 Welcome to this unit which discusses the ways of producing an airstream. We need this background knowledge about the total range of the phonetic capabilities of humans in order to describe the languages of the world phonetically. In the virtual session where, as usual, you have the question sheet as default guidance, you will be introduced to some general aspects of respiration as well as to the principles underlying the airstream mechanisms used in speech. The mastery worksheet is a dynamic multiple-choice test with ten questions about the same topic. After the virtual session, you should not find this test difficult at all. And the practical is all about speech-sound articulation using different airstreams. Not easy for beginners, but if you follow the instructions, you should manage. So all in all, a real practical unit. But if you invest a reasonable amount of time and practice, you will be fine.