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solutions of surfactant with different concentration by means of
equation (9.2).
9.4.4 Put the results of experiments and calculations into table
9.1.

Table 9.1 – The results of measurement of surface tension of
water solutions of surfactant by means of stalagmometer method
(the method of drops counting)

Index Designa- Unit of Concentration of surfactant, %
tion measure- mass.

ment 0 0.01 0.025 0.05 0.1 0.5 1
1 2 3 4 5 6 7 8 9 10
The volume

of 10 drops
3
of kerosene V 10 ker surfact m
)
in water so- ( V
10 ker water
lution of
surfactant
(distilled
water)

The volume
of 1 drop of
3
kerosene in V ker surfact m
water solu- ( V )
ker water
tion of sur-
factant (dis-

tilled water)
3
The densi- ρ surfact kg/m
ty of water

solution of
surfactant
3
The density ρ kg/m
ker
of kerosene
The capil- K mJ /

2.
lary cons- (m kg)
tant
The surface σ ker surfact mJ / m 2
tension

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