General
Hydrodynamics – A description of how fluids behave, from a Principles of Flight page
States of Matter
Changing States of Matter Interactive Activity – from BBC Kids, experiment with water at different temperatures
Solids, Liquids and Gases Interactive Activity – from BBC Kids, experiment with heating and cooling a substance
States of Matter Interactive Simulation– from PhET lab, explore phase changes with different substances
Gas Properties Interactive Simulation – from PhET lab, explore gas molecules as volume and heat is changed
Eureka Video on Volume and Density
Buoyancy
Balloons and Buoyancy Interactive Simulation – from PhET lab, explore by filling the balloons with different gases
Buoyancy Explorer Interactive Activity – from SEED, drop blocks into different liquids to see what will happen
Viscosity
Viscosity Explorer Interactive Activity – from SEED, learn how viscosity varies from liquid to liquid and how temperature affects viscosity
Hydraulics
http://www.howstuffworks.com/hydraulic.htm
http://www.howstuffworks.com/heart.htm
http://www.nationmaster.com/encyclopedia/Hydraulic
Pneumatics
http://www.howstuffworks.com/question130.htm
http://www.howstuffworks.com/question193.htm
http://inventors.about.com/od/pstartinventions/a/pneumatic.htm
http://www.amonline.net.au/FISHES/students/dissect/swimbladder.htm
http://kidshealth.org/kid/htbw/lungs.html
Additional Resources
One Drop – Discusses water issues around the world