Bubbles are one of the fascinating things. The most important thing that everyone notices on the bubbles are the interesting colours on the surface of the bubble.
We all, when we were kids, used to blow bubbles. The experience would indeed be wonderful. As you would have appreciated it's perfectness in geometry and mostly the colours on it, you would appreciate it better, if you knew the science behind it!
Courtesy: Google- WHAT IS A BUBBLE ?
Bubble is a thin layered sphere of liquid enclosing air or any other gas.
Let us in specific know about soap bubbles: Soap bubble is a bubble with it's surface showing luminous colours which seem to change, when seen from different angles, consisting of air in thin film of soapy water. However, they last for a very short interval of time and burst.
While reading the above sentences, one may catch the words " surface showing luminous colours".Ever wondered how are these colours formed?. Unlike the rainbow, where the colours appear due to series of refraction, the colours appearing on the surface of the soap bubbles are due to interference of light( both constructive interference and destructive interference) reflecting off from front and back surfaces of the surfaces of the bubble film. The colours on the surface of the bubble changes accordingly to its thickness.
Courtesy: Google- HOW IS A BUBBLE FORMED ?
The basic principle behind the formation of bubbles is surface tension. Bubbles are made using soap water. Here soap is an important additive since it is the soap that stabilizes the surface of the bubble by decreasing the surface tension, which allows it to stretch and hold its shape(the carbon and hydrogen molecules of the soap separate the water molecules in the mixture. as the distance between water molecules increases, hence surface tension decreases).Bubbles are sphere because it can sustain large number of molecules with least surface tension. Soap molecules surround the water molecules in the mixture, the hydrophilic end of the soap molecule points towards water molecules and the hydrophobic end is pointed away from water molecules. This indeed is how the surface of the bubble is formed. When air is blown, film traps the air in the center, causing it to retain it's shape.
Courtesy: Google
