Classification of Soil Particle Size

🧪 Classification of Soil Particle Size

Soil Separate	IISS Diameter (mm)	USDA Diameter (mm)
Gravel	> 2.0	> 2.0
Coarse Sand	0.2 – 2.0	0.5 – 1.0
Fine Sand	0.02 – 0.2	0.1 – 0.25
Silt	0.002 – 0.02	0.002 – 0.05
Clay	< 0.002	< 0.002