Information about Microbubble

Microbubbles are bubbles smaller than one millimetre in diameter, but larger than one micrometre. . The micro bubbles, which mostly contain oxygen or air, can remain suspended in the water for an extended period. Gradually, the gas within the micro bubbles dissolves into the water and the bubbles disappear. They are used in medical diagnostics as a contrast agent for ultrasound imaging.

For more information on microbubbles : http://www.nikuni.co.jp/bubble/index.html