An antibubble is a ball of liquid surrounded by a thin film of air. Pictures, documentation and links.
http://hot-streamer.com/antibubbles - New window - Cached - Archive -
Interactive animation shows how pressure and velocity in a fluid behave according to Bernoulli's Principle.
http://home.earthlink.net/~mmc1919/venturi.html - New window - Cached - Archive -
Experiments with smoke inside a plexiglass box challenge convectional wisdom. Smoke can unexpectedly act heavier than air and then spontaneously reverse.
http://www.synapse9.com/airbox.htm - New window - Cached - Archive -
Explanation of water hammer and pulsation inclusive the formula used to calculate the pressure increase.
http://www.plastomatic.com/water-hammer.html - New window - Cached - Archive -