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From Ehow:

"Specific gravity is the density of an object or liquid in comparison to the density of water at a certain temperature or pressure".

Density of water at 32 degrees Fahrenheit- 915kg/m^3.

Thanks.

"A pond is circular and 46 2/3 feet in diameter. It is frozen to an average depth of 1 5/11 feet."
height h = 16/11 ft
volume of ice = πr²h ≅ 88π ft³

1 ft³ water = 62.5 pounds
specific gravity of ice = 0.9
weight of 1 ft³ ice = 0.9×62.5 = 56.25 pounds

88π ft³ ice × 56.25 pounds/ft³ ice × 1 ton/2000 pounds ≅ 2.47 tons
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#### Janet Yang

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