Liquid Index

Liquid index, abbreviated as LI, a dimensionless number, is scaling the natural moisture content of a soil sample to the liquid limit and plastic limit.

 

Liquid Index formula

\(\large{ LI =  \frac{ w_n \;-\;PL }{ LL \;-\; PL }   }\)

Where:

\(\large{ LI } \) = liquid index

\(\large{ LL } \) = liquid limit

\(\large{ w_n }\) = natural water content

\(\large{ PL }\) = plastic limit