On Wed, 9 Jun 2021 19:57:35 +0100, Chris Green wrote:

T i m wrote:

Ulitimately of course *all* the energy ends up as heat.

What, even the stuff coming out as visible light / UV light?

Yes, of course, what else do you think happens to the energy?

I hadn't. ;-)

Some of the light may go out of your windows

So some (visible light) passing though my windows will heat the glass?

and the resultant heat is
lost from your house but the light will be absorbed by the atmosphere
and disappated as heat there.

Check.

I 'got' that radiated IR would 'heat' whatever was in it's path till
completely absorbed but I hadn't considered what would happen to
visible light etc (but appreciated it contained energy etc).

Ultimately a few photons worth of energy possibly escape into outer
space I suppose.

;-)

Cheers, T i m