Air Pressure
(Lecture #1)
(scroll down for links to the supplementary videos mentioned in the lecture)
Also read Hosken, ch. 1, pp. 14-17.
Note: I will post Hosken PDFs for the first week or two only.
Here is a good discussion of Torricelli's famous experiment where he measured the air pressure—and also created the first intentional vacuum!
Short videos on
middle-ear anatomy and on
ear-popping.