why the temperature of different objects vary?

On 7 Feb, 22:26, "Russel Sprout" wrote:
wrote in message

...

Why on a same day the temperature of different objects like, blue sky
and bricks, concrete, grass asphalt etc in shade and sun light varies
while measured by a thermal radiometer??

Why do you think they should have the same temperature?

From my recollection (40 years since my last physics lesson!) it's all
to do with the physical character of the object. Something black in
colour is black because it absorbs all of the radiation falling on it
- thus, it absorbs the maximum energy and thus will increase its'
temperature the most. A white object reflects pretty well all of the
radiation falling on it and hardly increases its' surface temperature.
Everything in between will vary in temperature. Grass looks green
because it reflects all other colours except green - which it absorbs.
As to why - it's all down to atomic structure......