construction testing equipment


1 kg Jar
Locking ring and rubber seal
Material used
Minimum Order Quantity
1 Piece

Product Description - Pycnometer

Pycnometer is a glassware or laboratory instrument used to measure the material properties of substances. It might look like a measuring bottle with a protruding glass hole or stopper, a sealed steel gravity cup, or even a high-tech kitchen blender whose jug sits on a pedestal with on-screen controls. This container makes a quick and accurate measurement of the density or specific gravity of a liquid.

The bottle uses standard measurements and calculates the volume by displacing its liquid. Forcing a liquid out of a small orifice using gas or pressure allows instant comparisons between volume measurements. This allows for a quick assessment of the porosity of substances, making these laboratory instruments a powerful addition to a facility.

Pycnometers are useful for determining the specific gravity of clay, sand and gravel less than 10 mm.

Standards: IS 2386 Part 3, BS 812

Pycnometer for Density

Powder pycnometer density gives the theoretical density of the powder and can also give an indication of problems with internal voids in a powder. For example, if a drop in pycnometer density is observed in different particle size cups or from batch to batch, a likely cause could be internal voids due to manufacturing technique.

The pycnometer density also provides a convenient test to evaluate the powder for batch-to-batch variations. In addition, the pycnometer density is used to determine the correct powder/polymer or raw material mixture. Powders and polymers can be evaluated using the pycnometer density to obtain the correct loading of solids in a mixture for predictable shrinkage.

Pycnometer is used to determine which Density

Two methods are suggested for the Pycnometer method for density determination:

One method uses a simple wet pycnometer in which the sample displaces water or other liquid and the result is determined by a gravimetric method.

The other method uses a vacuum to remove air from the sample, followed by introducing part of the liquid under a vacuum.

There is an unavoidable difference in the results and accuracy of each method. Differences in the values determined can also result from the choice of fluid used for displacement.

Procedure for Pycnometer Method Specific Gravity / How to use Pycnometer

  1. Clean and dry the pycnometer. Tighten the cap tightly. Take your mass (M1) to the nearest 0.1 g. 2. Mark the cap and pycnometer with a vertical line parallel to the axis of the pycnometer to ensure that the cap is always bolted to the same mark.
  2. Unscrew the lid and place approximately 200 g of oven-dried soil into the pycnometer. Unscrew the cap. Determine the mass (M2).
  3. Unscrew the cap and fill the pycnometer with enough deaerated water to cover the bottom. Unscrew the cap.
  4. Shake the content well. Connect the pycnometer to a vacuum pump to remove trapped air for approximately 20 minutes in fine-grained soils and approximately 10 minutes in coarse-grained soils.
  5. Disconnect the vacuum pump. Fill the pycnometer about three-quarters full with water. Reapply the vacuum for about 5 minutes until there are no more air bubbles on the surface of the water.
  6. Completely fill the pycnometer with water up to the mark. Dry it in the open air. Take your mass (M3).
  7. Record the temperature of the contents.
  8. Drain the pycnometer. Clean and dry it.
  9. Fill the pycnometer with water only. Unscrew the cap to the mark. wipe with a cloth Take your dough (M4).

Soil specific gravity observations and calculations / Pycnometer Formulae :

pycnometer formula

The specific gravity of the soil is determined using the relationship:

M1 = Empty pycnometer Mass,

M2= mass of the pycnometer on dry ground

M3= mass of the pycnometer and soil and water,

M4 = mass of the pycnometer filled only with water.

G= soil-specific gravity.

Related Products of Pycnometer

Shopping Cart



Get Best Quote