If wn = natural moisture content of the soil; wL = liquid limit of the soil; wp = plastic limit of the soil; Ip = plasticity index of the soil, The co

[Pankaj Sharma]

If wn = natural moisture content of the soil; wL = liquid limit of the soil; wp = plastic limit of the soil; Ip = plasticity index of the soil, The consistency index of a soil is defined as the ratio of
1] (wL+ wn)/Ip
2] (wL- wn)/Ip
3] (wn- wp)/Ip
4] (wn+ wp)/Ip