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 ?
Keng, Air and Helium Pycnometer, Powder Technology 3 (3), 179-180 (1969).
The pycnometer method and an Anton-Paar DMA4500 vibrating-tube densimeter were used to measure density values while thermal conductivity was determined by the Model KD2 Pro, Decagon Devices, Inc5.
s] was determined through a standard test procedure in a pycnometer and dry density [p.
The experiments were conducted using Pycnometer bottle for determining the particle specific density values of TS, [ATS.
The densities of the different essential oils were determined using a pycnometer.
Specific gravity of bio-oil was measured using 10-mL pycnometer glass (ASTM International 2002).
A final confirmation of the through wall porosity was conducted by evaluating the spheres pycnometer density before and after acid leaching.
The viscosity was determined with Ubbelohde glass capillary viscometer and density with a pycnometer.
Total soil porosity was calculated from particle (Blake and Hartge 1986a) and bulk density (Blake and Hartge 1986b), which were measured using the pycnometer method (50-mL flask) and core method (100 [cm.
After expansion, the particles were sieved to separate them by size and their density was measured using a pycnometer.