Classification of bubbles

Other nano- sized examples

　.    Molecule of water,Electromagnetic wave,Sunlight 

Picture of nano-bubbles in phase‐contrast microscope.

You can see a microbubble on the upper right which is with a diameter of 12 micro-meters.

Other white dots are nano-bubbles which is with a diameter of 100-300 nano-meters.

Nanobubbles are too small to be seen with eyes alone, so need a measurement device to see.

Same size comparison   　　Protein,　Macromolecule　

Microbubbles are moving like a cloud  in water. They are also called micro-nanobubble and/or fine-bubble.  Their diameter is approximately 10-30 μｍ. They are large enough to be observed with naked eyes.

                                                   Microbubble                                                                    Milibubble                                         『はじめての洗浄技術』工業調査会・日本産業洗浄協議会編より転載

 Other Milli- sized objects :  Colloid ,Cell            Other Centi-meter objects : Organ,Creature   

Bubble less than 1μm in diameter is called a ultra-fine-bubble and/or nano-bubble. bubble of 50μm or less in diameter  is called a micro-bubble and/or fine-bubble. The term of Micro-nano-bubble (MNB) is also used instead of nano-bubble and micro-bubble. It means that micro-sized bubble and nano-sized bubble are both including in the same liquid.

Click below to page details of behaviour of bubbles

Microbubble is not rise rapidly, but stay in water and gradually shrink by water pressure. They never combine each other as they got negative charge of electricity. On the other hand, milli-bubble is going up quickly to water surface and disappear.