Connection between emissivity and albedo

[mike133]

Hi,
I am studying thermal radiation. Does anyone know what is a connection between emissivity and albedo.
Regards,
Mike

 

[Andy Resnick]

Albedo is a reflection, so emissivity + albedo = 1, for opaque objects. There's probably some spectral weighting involved in the definition of albedo.

 

[K^2]

Albedo is a reflection, so emissivity + albedo = 1, for opaque objects. There's probably some spectral weighting involved in the definition of albedo.

You are confusing emissivity and reflectivity. [No, I'm confusing albedo and absorption. Sorry.]

Emissivity is equal to albedo at a given wavelength. If they were not equal, the heat could flow from colder object to hotter one via radiation.

 

[mike133]

I think Andy was correct.

For non transparent bodies:
emissivity+albedo=1

 

[K^2]

Yeah, you're right. I somehow confused albedo and absorption. Emissivity+albedo=1 is correct.