Mass of dry soil taken (passing 75 micron ) W (g) =
Specific gravity of soil grains, G_s =
Meniscus correction, C_m =

Elapsed time, t (min)

Actual hydro- meter reading, Rh

Temp., T (°C)

Compo- site correct- ion, C

Correc- ted hydro- meter reading, Rc1 = Rh+Cm

Effective depth, h (cm)

Viscosity, (g sec/cm2)

Factor M

Particle size, D (mm)

Rc2 = RhC

Factor N

% Finer w.r.t mass taken, F

% Finer w.r.t. total mass

Calculation of Particle Size
1. Enter hydrometer readings. Add meniscus correction and obtain corrected hydrometer readings R_c1.

2. From calibration plot, obtain effective depth h corresponding to R_c1.
3. Calculate value of
4. Obtain viscosity value h corresponding to temperature T. Calculate factor
5. Calculate particle size D by multiplying M and

Calculation of Percentage Finer
1. Add the composite correction C to the hydrometer reading to get another corrected hydrometer reading R_c2.
2. Calculate factor
3. Calculate percentage finer F by multiplying R_c2 and N.

4. Calculate percentage finer with respect to total mass of soil taken for sieve analysis and hydrometer analysis.
Total percent finer = F x fine-grained percent in the total soil mass.

Present results by plotting particle size vs. percent finer on a semi-logarithmic sheet.