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Construction for Landscape Architecture by Jamie Liversedge, Robert Holden

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Specific gravity

This is the ratio of the density of a material at a given temperature and pressure to the density of distilled water at 39.2ºF—and so the specific gravity of water is expressed as “1.” Note that specific gravity is a dimensionless unit; by comparison with water, iron has a specific gravity of 7.85. It is dense!

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