1. Aug 9, 2010

### Sify

Hello everyone,

I'm hoping someone can help me understand (in a most general fashion possible) a relations between radiometric quantities and physic of EM wave.

With EM wave quantities that are usually mentioned in books (at least the ones I've found) are:
- energy density of EM wave (this is a time dependent and position in space dependent value as far as I understand).
- Poynting vector (this is a time dependent and position in space dependent value as far as I understand).

Now within radiometry there are among others following quantities: