As per the classification of International Society of Soil Science, the silt particles comes in diameters in mm)

🔑 Key Points
🌾 Soil Classification (ISSS):
→ Gravel: Particle diameter > 2.0 mm
→ Sand: Particle diameter 0.05 to 2.0 mm
→ Silt: Particle diameter 0.002 to 0.02 mm
→ Clay: Particle diameter 2.0 mm
→ Sand: Particle diameter 0.05 to 2.0 mm
→ Silt: Particle diameter 0.002 to 0.02 mm
→ Clay: Particle diameter 2.0 mm) and Clay (< 0.002 mm) have the same particle diameter value in both USDA and ISSS classifications.

📝 Shortcut Trick
→ Remember the soil particle size by picturing each type of soil.