Scattering of light by dust particles

[Pushoam]

TL;DR Summary

Inside a dark room, when light comes through a hole, we see the dust particles as the particles scatter the light. But, when the whole window is open, we don't see the dust particles scattering the light. Why?

Inside a dark room, when light comes through a hole, we see the dust particles as the particles scatter the light. But, when the whole window is open, we don't see the dust particles scattering the light. Why?

 

[Ibix]

Because when the whole window is available the background is also bright and small bright dots are hard to see against a bright background.

 

[Dale]

when the whole window is open, we don't see the dust particles scattering the light.

I have seen dust particles scattering light many times in a room with an open window.

 

[hutchphd]

Its the same reason you can see stars (and planets) only at night, although sometimes one can see Venus and or the Moon in the daylight (to which @Dale alludes above.

 

[Pushoam]

Thanks to all.