What particle size range is classified as "Sand"?

The classification of sand in the context of particle size is specifically defined by the range of 0.075 mm to 4.75 mm. This is based on standard soil classification systems such as the Unified Soil Classification System (USCS) and the American Society for Testing and Materials (ASTM) specifications.

Sand is characterized by its granular texture and ability to drain well, which is a function of its size. Particles within this size range have enough space between them to allow water to flow through, giving sand its unique properties in construction and civil engineering applications, such as fill material and aggregate in concrete.

The other options do not fit this definition: particles smaller than 0.075 mm are classified as silt or clay, while larger particles are considered gravel or cobbles. Thus, the definition and classification based on the size range for sand is clearly articulated and recognized in civil engineering practices.