Is there a size comparison of a photon, an atom, and a virus in a book or somewhere online?

This visual display is the kind of thing I'm referring to. (it's pretty insane, eleven miles of webpage to show the distance between a proton and its electron -- although my visual needs are a bit more practical)

Photons have no size (although you can use wavelength, inwhich case take your pic).

 

As for the comparison to an atom to a virus, a virus can be 10 to 300nm (about that), whereas the smallest atom is 25pm, which is pretty much 3 orders of magnitude smaller (1000 times). The largest currently studied atom is around 150pm...

 

Just find things which have the same kind of order difference... Like a full stop and a lorry tire...

Photons have no size (although you can use wavelength, inwhich case take your pic).

 

As for the comparison to an atom to a virus, a virus can be 10 to 300nm (about that), whereas the smallest atom is 25pm, which is pretty much 3 orders of magnitude smaller (1000 times). The largest currently studied atom is around 150pm...

 

Just find things which have the same kind of order difference... Like a full stop and a lorry tire...

I take it pm is parts per million and nm is nanometers? If so, how many pm would equal 1 nm?

pm is picometer, or [math]10^{-12}[/math] meter.

 

nm is nanometer, of [math]10^{-9}[/math] meter.

 

parts per million is abbreviated as "ppm". It means 1/1000000, just like percent (%) means 1/100 and per mille (‰) is 1/1000.