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It's chemical. Phase changes [electronic resource] / AIMS Multimedia.
Chatsworth, CA : AIMS Multimedia, c1997.
1 computer optical disc : sd., col. ; 4 3/4 in. + 1 teacher's guide (35 p. : ill. ; 28 cm.) +1 installation guide.
Explores many questions about the different states of matter, including why water expands as it freezes while paraffin shrinks, why a person's breath fogs up a mirror, and how an iron anchor sinks right into a block of ice.