A certain material having a specific gravity of 3.52 in a 250 mL beaker was found to have weigh 484 g. What is the porosity of the material? a. 0.68     b. 0.38     c. 0.45    d. 0.29

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.