The specific weight of a substance can be calculated using the formula:
Specific Weight (γ) = Specific Gravity (SG) × Density of Water (ρw)
In this case, the specific gravity (SG) of mercury is given as 13.6. The density of water is approximately 9.81 kN/m³.
Using the formula, we can calculate the specific weight of mercury as follows:
γ = 13.6 × 9.81 kN/m³
This results in:
γ = 133.416 kN/m³
Rounding this value, we can conclude that the specific weight of mercury is approximately:
γ ≈ 133 kN/m³
Therefore, the correct answer from the options provided is d) 133 kN/m³.