The range of 2.6-2.7 Mg.m$^{-3}$ represents the following:
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Always keep in mind:
Standard average value for mineral soil particle density = \( 2.65 \text{ g/cm}^3 = 2.65 \text{ Mg/m}^3 \).
Bulk density is always lower than particle density and is typically around \( 1.33 \text{ g/cm}^3 \) (assuming 50% porosity).