| DCS # |
DEMONSTRATION |
REFERENCE |
ABSTRACT |
| 2A10.00 |
Force of Surface Tension |
|
|
| 2A10.10 |
sliding wire |
PIRA 500 |
|
| 2A10.10 |
sliding wire |
2A10.10 |
A soap film provides the force to slide a light wire on a frame. |
| 2A10.10 |
force on a film |
Fi-7 |
A soap film pulls a wire up a frame. |
| 2A10.10 |
sliding wire |
M-233 |
A soap film pulls a sliding wire up a U shaped frame. |
| 2A10.10 |
soap film pullup |
Disc 13-21 |
A soap film pulls a sliding wire up a "U" shaped frame. |
| 2A10.11 |
sliding wire |
16-5.1 |
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. |
| 2A10.12 |
sliding wire, etc. |
M-21a |
The sliding wire, wire cubes, and other soap film stuff is pictured. |
| 2A10.15 |
submerged float |
PIRA 1000 |
|
| 2A10.15 |
submerged float |
2A10.15 |
When submerged, a wire hoop keeps a float beneath the surface of water
due to surface tension. |
| 2A10.15 |
submerged float |
Fi-1 |
Surface tension holds a brass ring on a float beneath the water. |
| 2A10.15 |
submerged float |
M-213 |
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 |
PIRA 200 |
Float needles, paperclips, rings of wire, etc. on water. |
| 2A10.20 |
floating metals |
M-213 |
Float needles, paper clips, rings of wire, etc. on water. |
| 2A10.21 |
floating metal sheet |
PIRA 1000 |
|
| 2A10.21 |
floating aluminum sheet |
16-5.5 |
A sheet of aluminum will float on the surface of clean water. |
| 2A10.21 |
floating metal sheet |
Disc 13-20 |
Float a sheet of metal on the surface of distilled water and add weights
until the metal sinks. |
| 2A10.25 |
leaky boats |
PIRA 1000 |
|
| 2A10.25 |
leaky boats |
2A10.25 |
Try to float several large (one foot long) flat bottomed boats made
of different screen material or aluminum with different size holes. |
| 2A10.25 |
leaky boats |
Fi-16 |
A screen boat, razor blade, or small metal boat with a large hole all
float on water. |
| 2A10.25 |
watertight sieves |
M-218 |
A mesh boat floats until a drop of water is placed inside it. Dry cheesecloth
holds water in an inverted beaker. |
| 2A10.28 |
waterproof fabric model |
16-5.6 |
Paraffin coated pegs serve as large model fibers. Pictures. |
| 2A10.30 |
surface tension balance |
PIRA 1000 |
|
| 2A10.30 |
surface tension balance |
AJP 58(8),791 |
An improved method for measuring surface tension by the direct pull
method. |
| 2A10.30 |
adhesion balance |
M-261 |
A glass plate on one end of a balance beam is in contact with a water
surface. |
| 2A10.31 |
surface tension of mercury |
M-211 |
Use a Joly balance to measure the force required to pull a razor blade
out of mercury. |
| 2A10.32 |
pull on the ring |
M-210 |
Pull a large ring away from the surface of a liquid with a spring sale. |
| 2A10.33 |
surface tension disc |
PIRA 1000 |
|
| 2A10.33 |
surface tension disc |
Disc 13-19 |
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 |
PIRA 1000 |
|
| 2A10.35 |
cohesion plates |
2A10.35 |
|
| 2A10.35 |
cohesion plates |
Fi-10 |
Two heavy glass plates stick together when a film of water is between
them. |
| 2A10.36 |
cohesion plates |
M-259 |
There is a difference in cohesion of dry and wet plate glass. |
| 2A10.37 |
cohesion plates fallacy |
AJP 32(1),61 |
If they demonstrate cohesion, why do they fall apart when placed in
a bell jar that is evacuated? |
| 2A10.37 |
adhesion plates |
Disc 11-13 |
Atmospheric pressure holds two plate glass panes together. |
| 2A10.38 |
cohesion tube |
M-260 |
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 |
PIRA 1000 |
|
| 2A10.40 |
surface reaction |
Fi-6 |
Some soap is dropped onto a water surface covered with sawdust. |
| 2A10.40 |
drop soap on lycopodium powder |
M-222 |
Sprinkle lycopodium powder on the surface of water, then place a drop
of liquid soap on the surface. |
| 2A10.45 |
liquid fracture |
AJP 33(7),v |
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 |
PIRA 500 |
|
| 2A10.50 |
bubbles blowing bubbles |
2A10.50 |
A "T" tube apparatus allows one to blow two soap bubbles of different
diameters, then interconnect them. |
| 2A10.50 |
analysis of bubbles blowing bubbles |
AJP 46(10),978 |
The complete analytical solution to the two bubbles problem. |
| 2A10.50 |
soap bubbles |
Fi-3 |
A smaller bubble blows up a larger one when connected by a tube. |
| 2A10.50 |
bubbles blowing bubbles |
M-239 |
Blow bubbles of different size on a "T" tube. The smaller one will
blow up the larger one. |
| 2A10.50 |
two soap bubbles |
Disc 13-23 |
The smaller soap film bubble blows up the larger one. |
| 2A10.51 |
rubber balloons |
PIRA 1000 |
|
| 2A10.51 |
rubber balloons |
2A10.51 |
Do the bubbles with large rubber balloons. |
| 2A10.52 |
rubber balloons |
AJP 46(10),976 |
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 |
M-240 |
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 |
M-242 |
Make a large water balloon. |
| 2A10.60 |
surface tension bottle |
PIRA 500 |
|
| 2A10.60 |
surface tension bottle |
2A10.60 |
|
| 2A10.65 |
wet mop |
Fi-2 |
Surface tension pulls the strands of a small fluffy mop together when
wet. |
| 2A10.68 |
sponge action |
16-5.3 |
Water picked up by a wet sponge is greater than that picked up by a
dry one. |
| 2A10.69 |
surface tension |
16-5 |
Discussion of eight surface tension demonstrations. |
| 2A10.70 |
water droplets |
M-249 |
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 |
M-252 |
A drop of alcohol can roll on the surface of an alcohol dish. |
| 2A10.72 |
tears of wine ??? |
M-250 |
As 50 proof alcohol evaporates in a watch glass, the remaining liquid
forms drops that run down the sides. |
| 2A10.73 |
Plateau's spherule |
M-256 |
A method of projecting and strobing drops forming down from a vertical
orifice. |
| 2A10.74 |
bursting water bubble |
M-257 |
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 |
M-241 |
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 |
M-248 |
Spray clear mercury into distilled water - no coalescence. Then add
a little acid - coalescence. |
| 2A10.80 |
charge and surface tension |
PIRA 1000 |
|
| 2A10.80 |
effect of charge on surface tension |
Eb-14 |
Dripping rate is much greater from an electrically charged buret. |
| 2A10.81 |
surface tension with electric field |
16-5.4 |
Droplets from a orifice become a steady stream when connected to a
Wimshurst generator. |
| 2A10.83 |
electrostatic breakdown of surface t |
29-1.16 |
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 |
29-1.17 |
Water drops from a pipette at high potential are dispersed into droplets. |
| 2A10.85 |
changing drop size |
M-247 |
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 |
M-258 |
Olive oil sprayed on hot water forms droplets but on cold water forms
a slick. |