* The tiny bubbles in the liquid are called micro-bubbles when the
diameter of the bubbles is less than 100um, and the bubbles
with a diameter of less than 100nm are called nano-bubbles.
Micro-nano bubbles refer to bubbles with diameters ranging from a
few microns to hundreds of nanometers when they occur. These
bubbles are between micro-bubbles and nano-bubbles and have
physical and chemical properties that conventional bubbles do not
have.