2A10.00	Force of Surface Tension
DCS #	DEMONSTRATION	ABSTRACT
2A10.10	soap film pullup	A soap film pulls a sliding wire up a "U" shaped frame.
2A10.11	sliding wire	A sliding wire frame film with a spring on one end and a string pull on the other shows that tension does not increase with length.
2A10.15	submerged float	A cork and lead device floats with a wire ring above the surface. Push the ring below the surface and it remains until soap is added to reduce the surface tension.
2A10.20	floating metals	Float needles, paperclips, rings of wire, etc. on water.
2A10.21	floating metal sheet	Float a sheet of metal on the surface of distilled water and add weights until the metal sinks.
2A10.25	leaky boats	Try to float several large (one foot long) flat bottomed boats made of different screen material or aluminum with different size holes. A screen boat, razor blade, or small metal boat with a large hole all float on water.
2A10.25	watertight sieves	A mesh boat floats until a drop of water is placed inside it. Dry cheesecloth holds water in an inverted beaker.
2A10.30	surface tension/Adhesion balance	An improved method for measuring surface tension by the direct pull method. A glass plate on one end of a balance beam is in contact with a water surface.
2A10.31	surface tension of mercury	Use a Joly balance to measure the force required to pull a razor blade out of mercury.
2A10.32	pull on the ring	Pull a large ring away from the surface of a liquid with a spring sale.
2A10.33	surface tension disc
2A10.33	surface tension disc	A flat glass disc on a soft spring is lowered onto the surface of distilled water and the extension upon pulling the disc off the water is noted.
2A10.35	cohesion plates
2A10.35	cohesion plates
2A10.35	cohesion plates	Two heavy glass plates stick together when a film of water is between them.
2A10.36	cohesion plates	There is a difference in cohesion of dry and wet plate glass.
2A10.37	cohesion plates fallacy	If they demonstrate cohesion, why do they fall apart when placed in a bell jar that is evacuated?
2A10.37	adhesion plates	Atmospheric pressure holds two plate glass panes together.
2A10.38	cohesion tube	A long (2-4 m) tube full of water and sealed at the top will support the water column against gravity.
2A10.40	drop soap on lycopodium powder
2A10.40	surface reaction	Some soap is dropped onto a water surface covered with sawdust.
2A10.40	drop soap on lycopodium powder	Sprinkle lycopodium powder on the surface of water, then place a drop of liquid soap on the surface.
2A10.45	liquid fracture	Directions on making a tube filled with Freon 113 which will completely fill the tube on warming and fracture on cooling or when a weak neutron source is brought near after partial cooling.
2A10.50	bubbles blowing bubbles
2A10.50	bubbles blowing bubbles	A "T" tube apparatus allows one to blow two soap bubbles of different diameters, then interconnect them.
2A10.50	analysis of bubbles blowing bubbles	The complete analytical solution to the two bubbles problem.
2A10.50	soap bubbles	A smaller bubble blows up a larger one when connected by a tube.
2A10.50	bubbles blowing bubbles	Blow bubbles of different size on a "T" tube. The smaller one will blow up the larger one.
2A10.50	two soap bubbles	The smaller soap film bubble blows up the larger one.
2A10.51	rubber balloons
2A10.51	rubber balloons	Do the bubbles with large rubber balloons.
2A10.52	rubber balloons	The equation relating the internal pressure to the radius is derived and applied to the problem of the two interconnected unequal balloons.
2A10.55	pressure in a bubble	Connect a slant water manometer to a tube supporting a bubble. Vary the size of the bubble and note the change of pressure.
2A10.58	water balloon	Make a large water balloon.
2A10.60	surface tension bottle
2A10.60	surface tension bottle
2A10.65	wet mop	Surface tension pulls the strands of a small fluffy mop together when wet.
2A10.68	sponge action	Water picked up by a wet sponge is greater than that picked up by a dry one.
2A10.69	surface tension	Discussion of eight surface tension demonstrations.
2A10.70	water droplets	Small water droplets form on a surface not wet by water, droplets bounce off when sprayed on with an atomizer. Water droplets will roll across the surface of an overfull glass of water when projected out of a pipette at a small angle.
2A10.71	rolling drops	A drop of alcohol can roll on the surface of an alcohol dish.
2A10.72	tears of wine ???	As 50 proof alcohol evaporates in a watch glass, the remaining liquid forms drops that run down the sides.
2A10.73	Plateau's spherule	A method of projecting and strobing drops forming down from a vertical orifice.
2A10.74	bursting water bubble	A jet of water directed upward against the apex of a cone will cause the water to flow around and form a bubble. A drop of ether will decrease the surface tension and the bubble will collapse.
2A10.75	mercury bubbles	Air is blown into mercury covered by a dilute solution of ammonium chloride. Mercury bubbles rise to the surface and burst.
2A10.76	mercury drops	Spray clear mercury into distilled water - no coalescence. Then add a little acid - coalescence.
2A10.80	charge and surface tension
2A10.80	effect of charge on surface tension	Dripping rate is much greater from an electrically charged buret.
2A10.81	surface tension with electric field	Droplets from a orifice become a steady stream when connected to a Wimshurst generator.
2A10.83	electrostatic breakdown of surface t	Droplets shoot out of a pond of carbon tetrachloride on a Van de Graaff generator as electrostatic breakdown of surface tension takes place.
2A10.84	elecrostatic dispersion of water dro	Water drops from a pipette at high potential are dispersed into droplets.
2A10.85	changing drop size	As the amount of sodium hydroxide is varied in a dilute solution, the size of drops formed by a olive oil jet changes with the variation of surface tension.
2A10.95	temperature effects	Olive oil sprayed on hot water forms droplets but on cold water forms a slick.