School of Physics Lecture Demonstration Manual

Surface tension

Fb-1 Force Exerted by a Soap Film

Published: Thursday 09 March 2006

To demonstrate that liquid surfaces are in a state of tension.

Fb-3Soap Bubble Paradox

Published: Thursday 09 March 2006

To show that small bubbles have greater air pressure inside them than larger bubbles.

Fb-4 Capillarity

Published: Friday 10 March 2006

To demonstrate capillarity in water and mercury.

Fb-5 Minimum Area of Soap Film

Published: Friday 10 March 2006

To demonstrate that liquid surfaces tend to shrink to the smallest possible area.

Fb-6 Reducing Surface Tension

Published: Friday 10 March 2006

To demonstrate the reduction of surface tension.

Fb-8 Mercury Amoeba

Published: Friday 10 March 2006

To demonstrate that surface tension is influenced by surface charge density.

Fb-9 Mercury Gobbler

Published: Friday 10 March 2006

To demonstrate that electrical and chemical effects can vary the surface tension.

Fb-10 Surface Tension of Aqueous Solutions

Published: Friday 10 March 2006

To demonstrate that in general organic substances dissolved in water lower the surface tension.

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