Bill Nye: The Science Guy

Season 1 Episode 8

Phases of Matter

Aired Unknown Oct 29, 1993 on Disney Channel
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Episode Summary

Phases of Matter

Bill Nye is going through a phase - a phase of matter. Check out the "Phases of Matter" episode
to find out about rock-solid solids, liquidy liquids, and gassy gases. It's phase-tastic!
Everything around us is made of stuff called matter, and all matter is made of atoms. Matter is anything
that comes in three varieties, what scientists call phases. There are solids like rocks, cookies, and desks.
There are liquids like water, honey, and juice. And there are gases, we breathe air and the helium in
balloons. The main difference between the three phases is how fast the matter's atoms move.
All atoms move around because they have energy. The more energy that's in something, the faster the
atoms move. Atoms in an ice cube don't move very much - they're frozen in place. The atoms in liquid
water slip and slide around - that's why you can pour it and spill it. Water vapor atoms are moving pretty
fast - that's why they float around in air (a mixture of other gasses). Changing an object's phase of matter
is just a matter (ha, ha) of adding energy to atoms or taking it away.
Heating adds energy to atoms, and cooling takes energy away from atoms. If you fried an ice cube in a
pan on a stove, you would see all three phases of matter - ice cube, liquid water, and water vapor.
Watch the "Phases of Matter" show and your science will be solid!


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