3 ms·
That statement is confusing to me, by ambient temperature do they mean surface temperature? I thought it was impossible to cool something below ambient without
by throwaway23236 4y ago
That statement is confusing to me, by ambient temperature do they mean surface temperature? I thought it was impossible to cool something below ambient without adding energy into the mix?
- giuliomagnifico 4y agoYes I think they simply misured the surface temp of a nearby panel not painted with this white paint.
- yetihehe 4y agoDepends on what you use as "ambient". Those panels and paints emit radiation in frequencies where atmosphere is transparent, so they use "coldness of outer space" as ambient.
- thfuran 4y agoActually, it's not. There are materials that are both generally highly reflective and also have blackbody emissions with strong peaks in frequencies that the atmosphere is transparent to. Such materials can radiate enough energy into space to passively self-cool below nearby ambient temperature, even during the day.