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Calculate the ratio of the density of coal ash to the density of the water (Specific gravity of coal ash Gs)

**Known values:**

A 90 g sample of coal ash.

Total mass of pycnometer (a density bottle) with coal ash inside and filled with water = 720 g.

Mass of clean pycnometer filled only with water = 670 g

**Solution:**

Step 1: Find the mass of the water displaced by coal ash (i.e , same volume V) using Archimedes' principle.

Step 2: Specific gravity of coal ash calculation

**here:**

ρ_{s} the density of the dry coal ash

ρ_{w} the density of the water displaced by coal ash inside pycnometer

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