Pycnometer


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pycnometer

[pik′näm·əd·ər]
(engineering)
A container whose volume is precisely known, used to determine the density of a liquid by filling the container with the liquid and then weighing it. Also spelled pyknometer.

Pycnometer

 

a glass vessel of specific shape and volume that is used for measuring the density of substances in the gaseous, liquid, and solid states.

Density is measured with a pycnometer by weighing a substance, usually in the liquid state, that is placed in the device and fills the pycnometer to a mark on its neck or to the upper edge of a capillary tube, corresponding to the nominal volume of the pycnometer. The measurement of volume is considerably simplified if the pycnometer has a scale rather than a single mark. Pycnometers with a side capillary tube in which the stopper is the body of a thermometer are particularly convenient in operation. The density of solids is determined by placing them in a pycnometer with a liquid. Pycnometers of special shape, such as spherical, are used to measure the density of gases.

The major advantages of the pycnometric method for the determination of density are high accuracy of measurement (to 10-5 g/cm3), the possibility of using small quantities of material (0.5 to 100 cm3), the small area of free surface of the liquid in the pycnometer (which virtually eliminates evaporation of the liquid and absorption of moisture from the air), and the separation of the operations of thermostatic control and subsequent weighing.

REFERENCES

Izmerenie massy, ob”ema i plotnosti. Moscow, 1972.
GOST 7465–67: Piknometry stekliannye.
GOST 11723–66: Piknometry dlia opredeleniia plotnosti gaza.

S. S. KIVILIS

References in periodicals archive ?
The preparation was performed with a polyethylene aspirating pycnometer, and both components were weighed with a Mettler AT20 electronic microbalance.
Jin FX, Li LZ (2000) A few factors influencing the experimental results of measuring density of solid with pycnometer. College-Physical Experiment 13, 59-60.
bulk density by core method, particle density by pycnometer method (5) and water holding capacity was measured following the procedure of Klute and Dirksen (6).
An empty pycnometer bottle was weighed, filled with water and reweighed.
It consisted of an analytical balances (from Mettler Toledo) accuracy of 0.2% (estimated experimentally) and less than 0.5% pycnometer accuracy for sample solid volume measurements (AccuPyc from Micromeritics), given as the default error.
The specic gravity was determined by the Pycnometer method (ASTM D 854, 2012).
Specific gravity of the soil and WMF were determined using a pycnometer. Liquid and plastic limits were determined using the Casagrande apparatus and glass plate.
ASTM D854-14 Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer.
The density of each solution is measured by pycnometer (Thomas Glass Pycnometer Bottle, 2ml Capacity, [+ or -] 0.03 Specific Gravity) and different concentrations are made by adding deionized water to linearly correlate the base fluid density with concentration.
The density of each solution is measured by pycnometer (Thomas Glass Pycnometer Bottle, 2ml Capacity, [+ or -]0.03 Specific Gravity) and different concentrations are made by adding deionized water to linearly correlate the base fluid density with concentration.
For analytical and developmental purposes the company offers a GeoPyc 1360 and a Pycnometer that measures the envelope density for roller compactors.