What term describes the range of measured soil particle sizes?

• A. Soil classification
• B. Gradation
• C. Soil texture
• D. Particle size distribution

Answer: (B)

The correct term that describes the range of measured soil particle sizes is gradation. Gradation refers specifically to the distribution of different particle sizes within a soil sample. It provides information about the proportions of different size classes of particles, which are essential for understanding the soil's engineering properties and behavior.

Gradation helps in assessing how well the soil can compact, drain, and support loads, which is crucial in construction and civil engineering. A well-graded soil will have a variety of particle sizes, filling the voids between larger particles with smaller ones, enhancing its stability and strength.

Understanding gradation is important for various applications, like determining the suitability of materials for construction or predicting soil behavior under different conditions. Other terms, while related, do not precisely capture the concept of measuring the range of soil particle sizes as effectively as gradation does.