- 2A10. Force of Surface Tension
- 2A10.05 Water Filled Cup Many pennies can be dropped into a “filled” cup of water before it overflows.
- 2A10.10 Sliding Wire A soap film provides the force to slide a light wire on a frame.
- 2A10.15 Submerged Float Surface tension holds a brass ring on a float beneath the water.
- 2A10.20 Floating Metals Float needles, paperclips, rings of wire, etc. on water.
- 2A10.21 Floating Aluminum Sheet A sheet of aluminum will float on the surface of clean water.
- 2A10.25 Watertight Sieves A fine sieve will hold water if it is added carefully, but will leak if the underside is touched with a finger.
- 2A10.30 Adhesion Balance A glass plate on one end of a balance beam is in contact with a water surface.
- 2A10.32 Pull on the Ring Pull ring away from surface with spring.
- 2A10.33 Surface Tension Disk A flat glass disc on a soft spring is lowered onto the surface of distilled water.
- 2A10.35 Cohesion Plates Two heavy glass plates stick together when a film of water is between them.
- 2A10.40 Floating Metals and Soap Float small metal objects like paperclips and needles in water. Adding soap to the water will make the objects sink.
- 2A10.50 Bubbles Blowing Bubbles Blow bubbles of different sizes on a “T” tube.
- 2A10.51 Rubber Balloons Do the bubbles with large rubber balloons.
- 2A10.65 Wet Cat Surface tension pulls the strands of fur of a small fluffy cat together when wet.
- 2A10.70 Water Droplets Small water droplets form on a surface not wet by water.
- 2A15. Minimal Surface
- 2A15.10 Ring and Thread A loop of thread forms a circle when popped in the middle of a soap film.
- 2A15.11 Soap Film Minimal Surfaces Puncture various parts of the film that forms on a wire cube to get different geometrical shapes.
- 2A15.20 Soap Film Minimal Surfaces Wire frames dipped in soap film form minimal surfaces.
- 2A15.21 Catenoid Soap Film Dip two concentric circles of wire in soap and separate them to form a catenoid.
- 2A15.25 Surface Energy A soap film on an inverted funnel ascends.
- 2A20. Capillary Action
- 2A20.10 Capillary Tubes Fill a set of capillary tubes with water.
- 2A20.20 Surface Tension Hyperbola A large meniscus forms between two sheets of glass held at an angle in a pan of water.
- 2A20.35 Capillary Action Touch the end of a small glass surface with a small glass tube and the water is drawn into the tube.
- 2A20.40 Meniscus Add 4-penny finishing nails to a full glass of water until it overflows.
- 2A20.45 Meniscus Objects floating in a vessel cling to the edge until it is overfull when they go to the middle.
- 2A30. Surface Tension Propulsion
- 2A30.13 Surface Tension Boat Rub a match stick on a cake of soap or attach a piece of camphor and place in water.
- 2A30.21 Surface Tension Flea A drop of Duco cement will dart around on the surface of water, two drops will play tag.