Measurement of surface tension using the "break-away" method

VC3.1.2.2
Measurement of surface tension using the "break-away" method
Measurement of surface tension using the "break-away" method

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Description

Surface tension is a property of the surface (boundary layer) between a fluid and a gas, such as air. The surface of a liquid behaves like a stretched elastic film. This effect is the reason that water droplets form, for example, and helps make it possible for certain insects to walk on the water or for a coin to “swim” on the water.
Experiment C3.1.2.2 determines the surface tension of water and ethanol. Here it will be shown that water is characterised by a particularly high surface tension as compared with other liquids.
(Published value for water: 0.073 Nm-1, for ethanol: 0.022 Nm-1).

Components of equipment sets

1 36746  4  Surface tension determination device LD
1 664175  4  Crystallisation dish, 95 mm diam., 300 ml LD
1 314111  4  Precision dynamometer, 0.1 N LD
1 31153  4  Vernier callipers LD
1 30076  8  Laboratory stand II LD
1 30002  4  Stand base, V-shaped, small LD
1 30043  8  Stand rod, 75 cm, 12 mm diam. LD
1 30108  8  Clamp with hook LD
1 6719740  4  Ethanol, denaturated, 250 ml LD
GHS02GHS07 Danger H225 H319
1 6753400  4  Water, pure, 1 l LD
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