In soil moisture conditions, what is required for a "very firm" consistence?

A "very firm" consistence in soil indicates that the soil is compacted and has a significant degree of resistance to deformation when force is applied. This condition typically occurs when the soil is at a low moisture content. At lower moisture levels, cohesive forces among soil particles become more pronounced, leading to a firmer texture. Essentially, the lack of water reduces the lubrication between soil particles, making it more difficult to manipulate the soil structure.

Conversely, high moisture content would generally make the soil softer and more malleable. In wet conditions, the soil can become saturated, which decreases its consistency and makes it easier to manipulate due to the increased lubrication from water. This translates to a looser, more pliable texture that would not be classified as "very firm."

Dry weight and wet weight are not directly related to the consistence of the soil but rather describe the mass of soil under different moisture conditions. They do not define the mechanical strength or resistance to deformation that is associated with the term "very firm." Therefore, lower moisture content is essential for achieving that high level of compactness and firmness in soil consistence.