[yequalsx]

Perhaps you misspoke or I'm not understanding correctly what you mean but from the book:

"Another thing we can see from Fig. 1–4 is why ice shrinks when it melts. The particular crystal pattern of ice shown here has many “holes” in it, as does the true ice structure. When the organization breaks down, these holes can be occupied by molecules. Most simple substances, with the exception of water and type metal, expand upon melting, because the atoms are closely packed in the solid crystal and upon melting need more room to jiggle around, but an open structure collapses, as in the case of water."

[paulvs]

I misspoke, I meant shrinks.. thanks for the heads up.