According to the Unified Soil Classification System, silt particle sizes are in the range of 0. 002 mm to 0. 075 mm and sand particles have sizes in the range of 0. 075 mm to 4. 75 mm.

According to the Unified Soil Classification System, a # 4 sieve ( 4 openings per inch ) having 4. 75mm opening size separates sand from gravel and a # 200 sieve with an 0. 075 mm opening separates sand from silt and clay.

0.003 seconds.