Here i found some interesting articles, recipes, about soap bubble...do you remember your childhood? back then i had played
with soap bubble too, make my own recipe...and try to blow the largest bubbles...
From Wikipedia, the free encyclopedia
A soap bubble is a very thin film of soap water that forms a sphere with an iridescent surface.
Soap bubbles usually last for only a few moments and then burst either on their own or on contact with another object.
They are often used as a children's plaything, but their usage in artistic performances shows that they can be fascinating for adults too.
Soap bubbles can help to solve complex mathematical problems of space, as they will always find the smallest surface area between points or edges.
A bubble can exist because the surface layer of a liquid (usually water) has a certain surface tension, which causes the layer to behave somewhat like an elastic sheet. However, a bubble made with a pure liquid alone is not stable and a dissolved surfactant such as soap is needed to stabilize a bubble. A common misconception is that soap increases the water's surface tension. Actually soap does the opposite, decreasing it to approximately one third the surface tension of pure water. Soap does not strengthen bubbles, it stabilizes them, via an action known as the Marangoni effect. As the soap film stretches, the surface concentration of soap decreases, which causes the surface tension to increase. Thus, soap selectively strengthens the weakest parts of the bubble and tends to prevent them from stretching further. In addition, the soap reduces evaporation so the bubbles last longer, although this effect is relatively small.
Their spherical shape is also caused by surface tension. The tension causes the bubble to form a sphere, as a sphere has the smallest possible surface area for a given volume. This shape can be visibly distorted by air currents, and hence by blowing. If a bubble is left to sink in still air, however, it remains very nearly spherical, more so for example than the typical cartoon depiction of a raindrop. When a sinking body has reached its terminal velocity, the drag force acting on it is equal to its weight, and since a bubble's weight is much smaller in relation to its size than a raindrop's, its shape is distorted much less. (The surface tension opposing the distortion is similar in the two cases: The soap reduces the water's surface tension to approximately one third, but it is effectively doubled since the film has an inner and an outer surface.)
Soap bubbles blown into air that is below a temperature of −15 °C (5 °F) will freeze when they touch a surface. The air inside will gradually diffuse out, causing the bubble to crumple under its own weight.
At temperatures below about −25 °C (−13 °F), bubbles will freeze in the air and may shatter when hitting the ground. When, at this low temperature, a bubble is blown with warm breath, the bubble will freeze to an almost perfect sphere at first, but when the warm air cools and thus is reduced in volume there will be a partial collapse of the bubble. A bubble, blown successfully at this low temperature, will always be rather small in size: it will freeze quickly and continuing to blow will shatter the bubble.
Adding coloured dye to bubble mixtures fails to produce coloured bubbles, because the dye attaches to the water molecules as opposed to the surfactant. Therefore, a colourless bubble forms with the dye falling to a point at the base. Dye chemist Dr. Ram Sabnis, has developed a lactone dye that sticks to the surfactants, thus enabling brightly coloured bubbles to be formed. An example of this dye is crystal violet lactone.
Sample formulae
1. General purpose formula:
* 160 mL dishwashing detergent
* 1 gallon water
* 35 mL glycerin
2. Another general purpose formula:
* 100 g sugar
* 40 mL salt
* 1.4 L water (distilled water is better)
* 150 mL dish washing detergent
* 12 mL glycerin
3. Yet another general purpose formula:
* 1 part of washing-up detergent
* 2 parts of glycerin
* 3 parts of water
4. For long living bubbles:
* 1 part commercial bubble solution
* 1 part water
* 1 part cup glycerin
5. For no-tears soap bubbles:
* 60 mL baby shampoo
* 200 mL water
* 45 mL corn syrup
6. Already Hand made by experts cost is $5.00 with colour
Ok you are ready to blow some bubble !
Link :Tom Noddy's Bubble Magic
Read more...
