Bubbles contained in a liquid are not all visible to the naked eye. Bubbles with the size of a few millimeters in diameter show visible surfacing action in a liquid (as in carbonated drinks, air diffusers and air stones). The presence of fine bubbles of dozens of microns in diameter can be confirmed with white turbidity in a liquid, because these bubbles are scattering substances. Bubbles in diameter smaller than the wavelength of light (400 – 700 nanometers) are called ultra-fine nanobubbles. They are too small to see, even with powerful microscopes, and have remarkable properties which larger bubbles do not possess. These nanobubbles do not rise, moving horizontally in liquid, maintaining their availability to implode and release gas into solution as needed. Ultra-fine nanobubbles can remain in liquid for extended periods of time, months under certain conditions, are negatively charged, and are under extremely high pressure as compared to larger bubbles.