Redening of light from a certian density of particals

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The discussion focuses on the search for a formula to calculate the redshift of light influenced by a specific density of particles over a certain distance. It highlights the distinction between reddening caused by dust or gas, which alters the entire spectral shape, and redshift, which merely shifts the frequency or wavelength. Participants are encouraged to share resources or research findings related to this topic. Understanding these differences is crucial for accurate analysis in astrophysics. The conversation emphasizes the need for clarity in terminology when discussing light behavior in various contexts.
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i am trying to find a value for z or the redshift of light that would be caused by a certian density over a certian distance?
if anyone has a formula or knows of a place i can find out what resurch has been done it would be of great help thanks
fish
 
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The reddening of light by dust or gas is not the same as a "redshift". When a spectrum changes by "reddening", the entire spectral shape changes. When it changes by redshift, it just shifts in frequency/wavelength.
 

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