Websites
This PBS Nova site has a really neat interactive tool to virtually convert water, carbon dioxide, or hydrogen into their different states of matter.
This website has a bunch of easy and dare-we-say fun experiments that can be performed at home. Heck, you might even learn something.
Those guys and gals at NASA sure know what they're doing. On this website all things states of matter are explained.
Have a few minutes to kill? Do you like to push buttons and learn at the same time? If yes click the link. Do it.
This is a simple simulation showing the differences between the states of matter.
Videos
Who doesn't love a good Ted Talk? If you like Archimedes and how he thinks (err, thought) this Ted Talk is for you!
As the name suggests, this video provides a clear and simple introduction to the different states of matter.
Here is another introductory video covering the phases of matter. Clear, concise, and full of color.
Yet another awesome review, except this time the whole lesson is set to catchy music.
This video is a lesson on the condensed phases of matter. It may be lengthy but totally worth it. There are lots of visual demonstrations to go along with some of the more difficult concepts. This guy knows his stuff.
This video is for those who have mastered the states of matter basics. If you are ready to step it up to the next level, click here and behold the world of liquid crystals, supercritical fluids, and pseudosolids.