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Is there a single word used in English for the visibility of dust particles floating in a stream of sunlight?

real particles of dust in a sunbeam from the window
shutterstock.com

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    They are called "motes." – deadrat Jun 18 '15 at 20:33
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    I don't mean they actual particles themselves; I am referring to the phenomenon as a whole. – Jessica Jun 18 '15 at 20:35
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    In photography jargon, the technical term is backscatter. – Dan Bron Jun 18 '15 at 20:40
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    perhaps you are refering to haze? – SamuelVimes Jun 18 '15 at 20:42
  • I wasn't very helpful, was I? Sorry. I can't think of a noun, just adjectives. For an atmospheric phenomenon, "crepuscular rays." For general optics,"volumetric lighting." I hope that's better. – deadrat Jun 18 '15 at 20:50
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There is an uncommon word, dustlight, mainly appearing in literary works. It may serve as a single word for the whole phenomenon to describe the interplay between dust and light.

...there was no alternative but to count the remnant of the family savings in the feeable ray of moted dustlight that filtered down from the dingy opening.

The Possession of Immanuel Wolf: And Other Improbable Tales by Marvin Kaye


Beyond the dogs, the bottle, the old man, I saw santuario receding from view, glazed as it were by the scrim of dustlight.

Trinity Fields by Bradford Morrow

However, you can use mote to define the floating dust in sunlight:

A particle of dust, esp. one of the innumerable minute specks seen floating in a beam of light; (contextually) an irritating particle in the eye or throat. [OED]

An example from OED:

Moving freely about like the motes we see in the sunbeam.

1880, W. Wallace, Epicureanism


Scientifically, the phenomenon is light scattering.

You can check further details in the following links:

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The most widely-used technical term is 'scatter', and this is studied in Physics (Light), Astronomy, Meteorology and Hydraulics (measurement of flow). (click @ermanen's link)

Many authors say 'scintillate', for the light-effect, but always 'motes' are mentioned; so, scintillation by itself might not work.

Home By Marilynne Robinson
A few motes of straw managed to scintillate in any shaft of sunlight.

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You could, circumstances being appropriate, call the dust murk. Though it'd have to be sun shining into an otherwise gloomy place. And it's not specifically the sun-illuminated dust, but all the dust.

An adjective for the air is turbid, in that it has suspended particles.

motes/sunbeam/Tyndall effect are all more appropriate given the photo. Just adding some more terms in the event someone's not satisfied with the more straightforward words.

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Consider, skylight

The diffuse light from the sky, scattered by air molecules, as distinguished from the direct radiation from the sun.

Random House

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It's called a colloid! It's a chemical term that means evenly dispersed particles in gas solid or liquid.

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