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,
R_{h}

Temp., T
(°C) 
Compo
site
correct
ion, C

Correc
ted hydro
meter
reading,
R_{c1} = R_{h}+C_{m
}

Effective
depth,
h (cm) 

Viscosity,
(g sec/cm ^{2})

Factor
M 
Particle
size,
D (mm) 
R_{c2} =
R_{h}C


% 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 finegrained percent in the total soil mass.
Present results by plotting particle size vs. percent finer on a semilogarithmic sheet.
