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The Wonderful Properties of Water
Arti Schmidt
Water can exist in a solid, liquid, and gas form. A phase change is when one form changes to another. This happens when heat energy is either absorbed or released.
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A solid changing to a liquid is called melting, such as ice melting to liquid water.
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A liquid changing to a solid is called freezing, such as liquid water freezing into ice.
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A liquid changing to a gas is called evaporation, such as boiling water.
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A gas changing to a liquid is called condensation, such as fog on glass.
States of Matter
In a solid, molecules are packed closely together and move the slowest.
In a liquid, molecules are spread farther apart than in a solid and move faster.
In a gas, molecules are spaced the farthest apart and move the fastest.
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