What does the Plastic Limit in soil testing indicate?

The Plastic Limit is a critical parameter in soil mechanics that indicates the moisture content at which a soil changes from a semi-solid state to a plastic state. At this point, the soil can be deformed considerably without cracking, reflecting its ability to take on shapes when subjected to mechanical stress. This transition is key for understanding the workability of clays and is essential for practical applications such as soil stabilization and construction.

In geotechnical engineering, knowing the Plastic Limit helps in classifying soils and determining their engineering properties, such as shear strength and compressibility. This property plays a vital role in predicting how soil will behave under load, making it crucial for foundation design, earthworks, and other geotechnical applications.

Other options refer to different soil states or characteristics but do not describe the specific nature of the Plastic Limit. The point of transition indicated in the correct answer is fundamental to the understanding of the plasticity of soils, essential for assessing their suitability for various engineering projects.