Soap bubbles are basically an air bag wrapped inside a liquid soap water film. This membrane is composed mainly of water.
Bubbles form due to a special property of water molecules, which is the ability to suck and stick together.
Bubbles formed by the ability to attract and stick together water molecules.
The attraction between water molecules creates surface tension . This surface tension along with air pressure from inside and outside the bubble creates equilibrium, which helps maintain the bubbles for a while in the air.
However, because the equilibrium is very fragile, just a wind or their dry fingers impact will easily break the surface tension, causing the soap water layer to break and as a result bubbles explode.
Besides, dry air also causes water to evaporate from the membrane. This causes the coating to gradually become thin and eventually explode.
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