Convert density between kg/m³, g/cm³, g/mL, g/L, kg/L and lb/ft³.
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1 g/cm³ = 1 × 1000 ÷ 1 = 1000 kg/m³.
Problem: 25.0 mL of a liquid has a mass of 32.5 g. Find its density in g/mL and kg/m³, and its specific gravity.
ρ = 32.5 ÷ 25.0 = 1.30 g/mL
In SI: 1.30 × 1000 = 1300 kg/m³
Specific gravity = 1.30 ÷ 1.000 = 1.30 (no unit)
The liquid is denser than water, so it would sink if the two did not mix.
Quoted from Density and Specific Gravity Calculations — Formula and Worked Examples.
Problem: A piece of metal has a mass of 53.8 g. Dropped into a measuring cylinder, it raises the water level from 20.0 mL to 26.0 mL. Find its density and suggest what the metal might be.
Step 1 — volume by displacement. V = 26.0 − 20.0 = 6.0 mL
Step 2 — density. ρ = 53.8 ÷ 6.0 = 8.97 g/cm³
Copper has a density close to 8.96 g/cm³, so copper is a reasonable suggestion. As with molecular mass from vapour density, a single physical constant narrows the field rather than proving an identity — brass and nickel are also in this range.
Two practical points examiners look for: the metal must not dissolve in or react with the liquid, and it must sink completely, or the displaced volume is not the volume of the solid.
Quoted from Density and Specific Gravity Calculations — Formula and Worked Examples.
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