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20
3.684
1 gallon of water = 231 cubic inches.
The volume is that of a cylinder: radius = ½ × diameter volume = π × redius² × height = π × (½ × 3)² × 5 ft³ = 11¼π ft³ ≈ 35.343 ft³ What this is in gallons depends upon the gallon used: 1 ft³ ≈ 6.229 imp gal → 35.343 ft³ ≈ 35.343 × 6.229 imp gal ≈ 220.15 imp gal 1 ft³ ≈ 7.481 US gal → 35.343 ft³ ≈ 35.343 × 7.481 US gal ≈ 264.38 US gal
Density = Mass/Volume = 3.68 grams per cubic centimetre.