Absolute Zero: an interactive site about the states of matter
Water is the only substance on Earth that occurs naturally as a solid, liquid, and gas. It does so because the temperature and pressure on our planet are just right to allow ice, liquid water, and water vapor to form. But scientists can artificially transform substances that occur naturally in only one or two forms of matter into other forms—for example, converting carbon dioxide gas into solid carbon dioxide (dry ice). They do this by altering the temperature and/or pressure surrounding a substance. In this interactive, adjust the temperature and pressure of three common substances and watch them morph into different states of matter. Along the way, you'll see just how inextricably temperature and pressure are linked.—Richard Pommier Swanson
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