Soap Bubble...
A soap bubble is very common, especially for those that are use to washing clothes or doing dishes with detergent. I want to give a brief definition of a soap bubble, you will find it below:
A soap bubble (commonly referred to as simply a 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. Link
When light shines onto a bubble it appears to change colour. Unlike those seen in a rainbow, which arise from differential refraction, the colours seen in a soap bubble arise from light wave interference, reflecting off the front and back surfaces of the thin soap film. Depending on the thickness of the film, different colours interfere constructively and destructively. Link
The implication of this usually in various ways, there are different explanation about the soap bubble and how it comes to be. There is the mathematical definition and explanation, as well as physics explanation and I am sure there will be an explanation by the chemist.
But I think it is best to leave the meanings to a layman because most of us are familiar with the concept.
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