What is referred to when soil has a consistent size across particles?

The term that describes soil with consistently sized particles is "uniformly graded." This classification indicates that the soil consists of particles that are similar in size, which can significantly influence its engineering properties. Uniformly graded soils often have predictable behavior under loading, drainage, and compaction conditions.

In contrast to uniformly graded soil, coarse soil refers simply to soil with larger particles, but it does not imply that all particles are the same size. Gaps graded soil contains a variety of particle sizes with significant voids, leading to potential issues with compaction and stability, while varied grained implies a mix of different sizes without the consistency that uniformly graded indicates. Thus, uniformly graded is the best choice for describing soil with particles that are of similar size throughout.