--> //initializations

--> D=100 //mm (depth)
 D  = 

   100.


--> He=10 //ml (capacity of pipette)
 He  = 

   10.


--> Md=0.3 //gm (mass of sample when dried)
 Md  = 

   0.3


--> t=7 //min (time of taking sample)
 t  = 

   7.


--> V=500 //(volume of soil suspension in the sedimentaion tube)
 V  = 

   500.


--> M=25 //gm (dry mass of the soil used in the suspension)
 M  = 

   25.


--> G=2.7 //(specific gravity)
 G  = 

   2.7


--> n=10.09 //milli poise (coefficient of viscosity)
 n  = 

   10.09


--> Dw=1 //gm/ml (density of water)
 Dw  = 

   1.


--> g=9.81 //
 g  = 

   9.81


--> //calculations

--> p=n/1000 // (coefficient of viscosity)
 p  = 

   0.01009


--> D=sqrt (0.3*p*He)/(g*(G-1)*Dw*t) //(diameter of the sphere)
 D  = 

   0.0014904


--> MD=Md/He //(mass of particles per ml of suspension at depth He)
 MD  = 

   0.03


--> Ms=M/V //(mass of particles per ml of suspension at the beginning of sedimentation)
 Ms  = 

   0.05


--> N=(MD*100)/Ms //(coordinate of the point)
 N  = 

   60.


--> //results

--> printf('coordinates of the point on the particle-size distribution curve=%d',N) //%
coordinates of the point on the particle-size distribution curve=60