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

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## 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.

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’.

 Subject Soil Mechanics Unit Soil Formation & Properties of Soil Topic Water Content or Moisture Content Next Topic Determination of Water Content of Soil Previous Topic Phase Diagram of Soil

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