The specific gravity of mercury is 13.574 (using water as a reference).
To calculate the specific gravity of mercury, you need to follow a couple of steps:
Take a volume of mercury, say V = 10 mL.
Measure the mass of the volume: m = 135.34 g.
Measure the density of mercury: ρ = m [g]/V [cm³] = 135.34 g/ 10 cm³ = 13.534 g/cm³.
Take the density of water: ρw = 0.997 g\\cm³.
Compute the ratio ρ/ρw: sg = ρ/ρw = 13.534/0.997 = 13.574.
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