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6.4.2 Determining the density of liquid (formation water)
by means of pycnometer.

6.4.2.1 Determine the mass of dried and cooled to the ambient

temperature empty pycnometer with accuracy 0.0002 g (m, g).
6.4.2.2 Pour the distilled water into pycnometer by means of
the funnel a little bit over the mark (for pycnometers of the 2nd, 3rd

and 5th types) and to the top (for pycnometer of the 4th type).
Сlose pycnometer by plug and put it into the water thermostat for
20 minutes (keep the constant temperature of water in the thermostat
20 °С ± 0,1 °С).

6.4.2.3 Take pycnometer out of the thermostat, wipe it, fix

accurately the level of water in it to the mark by means of the filter
paper and determine the mass of pycnometer with distilled water (with

the accuracy 0.0002 g) – m , g.
1

6.4.2.4 Discharge pycnometer, wipe and dry it and pour the tested

liquid (for example, formation water) into pycnometer (accurately to
the mark). And then repeat the same operations with the tested liquid
(formation water) and as the result you will get the mass of

pycnometer with the tested liquid (m , g).

2

6.4.2.5 The density of the tested liquid by means of pycnometer

is calculated by the following equation:

(m - m) 0.99823
ρ l 20  2 , (6.6)
m - m
1

where ρ is the density of the tested liquid determined by means of
l 20
3
pycnometer under the temperature 20 °С, g/сm ; m is the mass of
dried empty pycnometer, g; m is the mass of pycnometer with

1
distilled water, g; m is the mass of pycnometer with the tested
2

liquid (for example formation water), g; 0.99823 is the magnitude of
3
density of distilled water under the temperature 20 °С, g/сm .
6.4.2.6 Put the results of the measurements by means of

pycnometer into table 6.4.
6.4.2.7 Draw the conclusion.

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