Antibubble

[3] Antibubbles can be created by allowing a tap to drip into a container of water to which a drop or two of soap has been added.

[5][6] The soap reduces the water's surface tension and allows the skin of air surrounding the droplet to remain in place for more than just a fraction of a second.

As antibubbles can be easily created at home, they have attracted attention from popular science magazines.

Using a drinking straw to drop droplets of sugar solution onto soapy water will produce antibubbles that sink.

This can be prevented by tipping a few teaspoons of sugar into the soapy water and giving it some time to dissolve (but without stirring it).

Antibubbles made from sugar solution will then sink through the water and rest on top of the denser layer at the bottom.