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
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
Ïs the density of the dry coal ash
Ïw the density of the water displaced by coal ash inside pycnometer