Heat Transfer Day 2 Absorption of Radiant Energy

Heat Transfer Day 2

Absorption of Radiant Energy and are = • Good absorber appears processes reflector ; no is • i. e. pupil, open door Good • = objects reflect more and

Emission of Radiant Energy and processes Good are proportional = Good • i. e. radio antennae: good = good • If this was not true, would remain than lighter-colored objects and never come to • Each object as much as it • Black container versus shiny, mirrorlike container • Fig 22. 16 p 333

Being a If surface is or than depends on , it will and

Newton’s Law of Cooling An object at a from its with its reach The much of an object depends on how the objects is than standing in the arctic versus standing in your backyard at night The the of an object is approximately to the between and its smarter to keep your inside on a

Global Warming and the Greenhouse Effect All things and depends on the temp = The depends on the of the object wavelength of things (i. e. air and glass) Air transparent to If air contains excess Glass is & but , it is waves

Earth’s Atmosphere Earth’s atmosphere ( waves) Earth and reradiates at Energy Atmospheric Warms Earth and

between helps keep temperature and (usually closer to 27°C) Without global warming, Increasing (and other gases) in the continues to and produces new unfavorable to the biosphere Greenhouse effect: atmospheric conditions cannot mix with