PPT Slide

16

• Unlike most other substances, solid water  occupies more space than liquid water; i.e.,  water expands on freezing.

• The smaller volume of the liquid means that ice  melts under pressure; the solid-liquid line for water slopes to the left rather than to the right.

• The higher the pressure, the lower the freezing  temperature of water.

• Ice has a lower density than liquid water.

• The 6-sided symmetry of snowflakes  reflects the hexagonal molecular arrange- ment of water molecules in ice.

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