Soap film
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Soap films are thin layers of liquid surrounded by air. For example, if two soap bubbles come into contact, they merge and a thin film is created in between. Thus, foams are composed of a network of films connected by Plateau borders. Soap films can be used as model systems for minimal surfaces, which are widely used in mathematics.
Figure 3: thin film interference in a soap bubble. Notice the golden yellow colour near the top where the film is thin and a few even thinner black spots
Figure 4: Picture of a film taken during its generation. The film is pulled out of a soapy solution and drains from the top.
Figure 5: Magnified view of black spots in a soap film
Soap bubble
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A soap bubble is an extremely thin film of soap or detergent and water enclosing air that forms a hollow sphere with an iridescent surface. Soap bubbles usually last for only a few seconds before bursting, either on their own or on contact with another object. They are often used for children's enjoyment, but they are also used in artistic performances. Assembling many bubbles results in foam.
A soap bubble
Girl blowing bubbles
Many bubbles make foam
Soap bubbles can easily merge