Water Content or Moisture Content | Properties of Soil | Soil Mechanics

  Water Content or Moisture Content  

Water content (w)

It is defined as the weight of water to the weight of solids present in the given soil mass.

Moisture content (m)

It is defined as the mass of water to the mass of solids present in the given soil mass. The result of water content & moisture content is the same.

Water content Or Moisture Content is the Unit less.

  Water Content or Moisture Content 
Phase Diagram of Soil

m= ( mass of water/ mass of solids )*100

When We numerator and denominator are multiplied by Gravity (g). Then moisture content changes into the water content.

w = (Weight of water/ Weight of Solids )*100

w = ( Ww / Ws ) *100.

w ≥ 0% (When a sample is dry, water content w=0% and increase the water in soil water content is increased).

w = Water content.

Ww = Weight of water.

Ws = Weight of Solids.

W = Total weight of soil = (Ws + Ww).

Relation in between Ws, w, & W.

w = Ww / Ws.

w +1 = ( Ww / Ws ) +1

w + 1 = ( Ww+Ws) /Ws = W/Ws.

Ws = W/ (w+1). or Ms= M/(m+1).

Water content can also be represented in terms of the total weight of soil (w’).

w’ = (Weight of water/ Weight of Soil )*100.

w’ = ( Ww / W ) *100

0% ≤ w'<  100% ( Here w’ is less than 100% because, if w’ is equal to 100% then the weight of water (Ww) is equal to the weight of soil(W) means no soil present in soil mass, only water present that is no soil).

Relation in between w & w’.

w’= Ww / W.

w’ = Ww / ( Ww+ Ws ) .

w’ = (Ww / Ww) /(Ww/Ww + Ws/Ww ) = 1 / ( 1 + 1/w ).

w’ = w / 1+w.

or w= w’ / 1-w’.

Weight of solids is comparatively stable in comparison to the weight of soil as it does not change with a change in the weight of water, hence the engineering significance of w>w’.

SubjectSoil Mechanics
UnitSoil Formation & Properties of Soil
TopicWater Content or Moisture Content
Next TopicDetermination of Water Content of Soil
Previous TopicPhase Diagram of Soil



Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top