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Because they are made of air with a little water around it. The surface tension in a soap bubble (or other similar bubble) holds it together until evaporation or gravity cause it to rupture.
http://wiki.answers.com/Q/Why_do_bubbles_burst_so_easil...
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Bubbles burst when the air pressure in the bubble changes and the film holding the air inside the bubble is no longer strong enough to contain it.
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hubpages.com/hub/Why-Do-Bubbles-Burst-So-Easily
hubpages.com/hub/Why-Do-Bubbles-Burst-So-Easily
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When soap bubbles settle into a container of carbon dioxide, the bubbles float on the carbon dioxide and can be examined closely. Under this close examination, soap bubbles reveal many properties that are not otherwise easily seen.
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scifun.chem.wisc.edu/HOMEEXPTS/SOAPBUBL.html
scifun.chem.wisc.edu/HOMEEXPTS/SOAPBUBL.html
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Exterior and interior air pressure, thickness of the bubble surface layer, and low surface tension being exceeded by the air pressure inside the bubble. I have no idea if that's correct or not
http://answers.yahoo.com/question/index?qid=20081209183...
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Because they are weakest possible art stuff, they only have a liquid skeleton like earthworms and caterpillars. Life is short when you have a liquid skeleton.
http://science.waxoil.com/conundrum/bubbles.php
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BUBBLEOLOGY Bubbles form easily with the right mix of soap and water. ... So what exactly is this stuff that fascinates children, ... Bubbles eventually burst once the layer of water evaporates, but adding glycerin lengthens the life span of bubbles. Glycerin forms weak hydrogen bonds with water, delaying evaporation. Dry air or...
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pubs.acs.org/cen/whatstuff/stuff/8117sci3.html
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OK lets get back to our main premise: BURSTING BUBBLES... It doesn't take very much to "burst a bubble" does it? Bubbles are very fragile and delicate. You can burst a bubble very easily. Sometimes two bubbles can hit each other and not pop but then again they can just pop all by themselves. ... Don't think so.
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www.annieshomepage.com/bubble.html
www.annieshomepage.com/bubble.html
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[Questioner] Sadness: I am sad, since I am a child...doesn't mean that I run around and cry, but someone asked me about it...so I remembered that I am sad. ... [Questioner] I used to view w/shops as places where people went to burst that sadness bubble from time to time. This would sorta fit with Wilhelm Reich's theory too...
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www.oshana.org/answers/bubbles_burst.html
www.oshana.org/answers/bubbles_burst.html
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BUBBLES MAY BURS ... I just finished a spellbinding book: "The Day the Bubble Burst: ... Our local nightmare with Pacific Lumber could easily have been featured in the same movie: corporate raider Charles Hurwitz completed a "hostile takeover" of PL in 1985. It was a "leveraged buyout," "leverage" meaning borrowed money.
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www.humboldt1.com/~bri/finance.htm
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