**volumetric relation**. the voids ratio define how much voids present as compared to total solids in soil mass, where porosity say how much voids as compared to total volume of soil mass, in void ratio if the void increase in soil mass only top value change. but in

**porosity both top and bottom value change**.ðŸ‘ˆ there is a relation between void ratio and porosity which very important in soil problem discuss below.

## The relation between porosity and void ratio

**(e) = Vv / Vs**

**(n) = Vv / V**

**V represent volume**and second letter

**also**the

**volume of voids = Vw + Va**

**Now**finding the relation between

**(e) and (n)**

we know value of n, Firstly writes its

Now we reverse the equation by dividing by 1

total volume come upward due to divide

putting total volume V = Vv + Vs

**Also**we know Vv / Vs is void ratio and our value is just it reverse

putting e which divide by 1 so our value as according to the equation

star mark equation is most important you can find e from n and n from using this equation.

firstly finding e value from n

first transfer the 1 from the right side to the left side

then take l cm as shown in fig

the last step is lust reverse the value which give our final equation

**we can also find **an equation where n is find by e

just write the stat mark equation

an instant of transfer 1 toward left side this time

just take l cm of right side equation

now simply reverse the equation

and we ger a equation where you find porosity by using void ratio only.