On 06/08/15 15:52, Alastair wrote:
Dawlish,

On Page 576 of University Physics with Modern Physics, Technology
Update, Thirteenth Edition (2010), which continues to set the
benchmark for clarity and rigor combined with effective teaching and
research-based innovation, they write:

"Radiation. Heat transfer by radiation is important in some
surprising places. A premature baby in an incubator can be cooled
dangerously by radiation if the walls of the incubator happened to be
cold, even when the air in the incubator is warm. Some incubators
regulate the temperature measuring the baby's skin ..."

Hot objects radiate heat which warms adjacent objects. Cold objects
radiate cold which cools adjects objects. The latter is difficult to
demonstrate because it is more difficult to maintain a constant cold
temperature than a high temperture. The latter is easy using
electrical heating. However, holding a thermnometer over an object
taken from a freezer will cause the temperature shown to drop.

I hope you will now realise that you are wrong, will apologise and
admit your mistake. Cold radiation does exist.

Cheers, Alastair.


I think you are getting confused with the human feelings of hot and
cold. If you stick with the words 'higher and lower temperatures' and
use well defined objects and laws, viz black-body, black-body radiation
and Stefan-Boltzmann law, then rewrite what you are trying to say and it
may clarify things?