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# What is photo emissivity?

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###### 2014-10-06 21:16:30

Emissivity of a surface is defined as its effectiveness in emitting thermal radiation. The term photo emissivity is likely used to narrow the focus to emitting visible light.

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## Related Questions

The term "emissivity" refers to the relative power of a surface to emit heat by radiation. It could also be defined as the ratio of energy radiated by a particular material to energy radiated by a black body.

Emissivity - relates to the amount of abillity of a material to emit heat. It is a measure of a material's ability to radiate absorbed energy

The concept involved here is Emissivity - the ability to emit energy. e is the usual symbol, and a perfect emitter would have an e of 1. Your perfect black body will have this emissivity of 1.A highly polished surface (polished at all the wavelengths concerned) will have an emissivity much smaller. Polished silver has an emissivity of about 0.02.In general the emissivity of a surface is inversely related to its reflectance, but this does vary with the surface finish, colour, and the mass of the object.It is worth noting, that low emissivity glass is used with effect in the double glazing of windows.

Yes, in principle, but only if their emissivity is independent of temperature. Generally, emissivity is a very weak function of temperature.

it has no unit as it is a ratio of two similar quantities

Zero emissivity means generally no radiation for the far-field. However, for the near-field case, energy may flow to another bodies.

Emissivity of the black body is 1. And this is probably the reason that the condenser of refrigerator is painted black to loose heat efficiently by radiation ,though there are other modes of heat transfer like conduction and convection which is not affected by colour of the body

Properties of the material such as thermal conductivity, specific heat, and emissivity, and the temperature of the surroundings.

Erik Sletten has written: 'High emissivity coatings for IR-temperature measurements'

Radiative heat transfer (heat transfer by electromagnetic radiation) is proportional to e*(T1^4 - T2^4) where T1 is the absolute temperature of the material, T2 is the absolute temperature of the surroundings, and e is the emissivity coefficient. A black material has a high emissivity coefficient, while a silvery material has a low emissivity coefficient. However, the emissivity coefficient cuts both ways, so to speak. A black material in thermodynamic equilibrium with its environment absorbs more radiation, true. But it also emits more radiation (this is necessary for equilibrium to hold). Likewise, a silvery material absorbs less radiation, and also emits less radiation. Conductive heat transfer ensures that the black material on the surface of the heat sink remains hot. The surroundings are at a lower temperature. Therefore T1 and T2 are set, and the heat transferred from the heat sink to the surroundings is simply proportional to e, the emissivity coefficient.

Photo Gallery is a collection of photo.

* You name's* Photo StopPhoto StopBest Photo*Your town* PhotoPhoto Stop ShopA Photo Is Worth 1000 WordsSmile and Say Cheese!Cheese! Photo ShopI like the italicized ones!

I like you photo : j'aime ta photo (that's) like your photo : (c'est) comme ta photo

A digital photo is a photo that can be shared electronically.

I do not like having my photo taken.He noticed something spooky in the photo.We have a photo shoot later.

La photo ("the photo") is feminine in French.

Photo can not be abbreviated because photo is the abbreviation of photograph.

Photo Scraps and their Location: Photo Scraps, Photo 1 - Talk to Inspector Chelmey Photo 2 - On the steps near to Gertie - The pancake lady Photo 3 - On the ground just beyond Gertie Photo 4 - On the rubbish tip in Litter filled Alley Photo 5 - Further up the Alley a couple of moves up beyond Gertie. Photo 6 - Talk to Dylan in the Alley Photo 7 - Enter the door at far end of the Alley photo scrap is on the floor. Photo 8 - Talk to Hopper, Northeast Alley Photo 9 - Receive photo scrap from answering clue 112. Photo 10 - Photo scrap on the ground where Lila is standing. Photo 11 - Photo scrap on the ground near to the Tower and Grocers Shop. Photo 12 - Photo scrap on the ground near to the Cabaret. Photo 13 - Receive photo scrap from answering Clue 101. Photo 14 - Talk to Joanie outside the Antique Shop. Photo 15 - Photo scrap on the ground outside the Hotel. Photo 16 - Collect the remaining photo scrap from the top of the gate leading to Mine and Forest - Talk to Rory.

If you were the person who uploaded the photo, click on the photo you want to delete and scroll down to the option where you can tag the photo, make the photo your profile picture, etc. One of the options is to delete photo.

Photo Scraps, Photo 1 - Talk to Inspector Chelmey Photo 2 - On the steps near to Gertie - The pancake lady Photo 3 - On the ground just beyond Gertie Photo 4 - On the rubbish tip in Litter filled Alley Photo 5 - Further up the Alley a couple of moves up beyond Gertie. Photo 6 - Talk to Dylan in the Alley Photo 7 - Enter the door at far end of the Alley photo scrap is on the floor. Photo 8 - Talk to Hopper, Northeast Alley Photo 9 - Receive photo scrap from answering clue 112. Photo 10 - Photo scrap on the ground where Lila is standing. Photo 11 - Photo scrap on the ground near to the Tower and Grocers Shop. Photo 12 - Photo scrap on the ground near to the Cabaret. Photo 13 - Receive photo scrap from answering Clue 101. Photo 14 - Talk to Joanie outside the Antique Shop. Photo 15 - Photo scrap on the ground outside the Hotel. Photo 16 - Collect the remaining photo scrap from the top of the gate leading to Mine and Forest - Talk to Rory.

Photo Scraps, Photo 1 - Talk to Inspector Chelmey Photo 2 - On the steps near to Gertie - The pancake lady Photo 3 - On the ground just beyond Gertie Photo 4 - On the rubbish tip in Litter filled Alley Photo 5 - Further up the Alley a couple of moves up beyond Gertie. Photo 6 - Talk to Dylan in the Alley Photo 7 - Enter the door at far end of the Alley photo scrap is on the floor. Photo 8 - Talk to Hopper, Northeast Alley Photo 9 - Receive photo scrap from answering clue 112. Photo 10 - Photo scrap on the ground where Lila is standing. Photo 11 - Photo scrap on the ground near to the Tower and Grocers Shop. Photo 12 - Photo scrap on the ground near to the Cabaret. Photo 13 - Receive photo scrap from answering Clue 101. Photo 14 - Talk to Joanie outside the Antique Shop. Photo 15 - Photo scrap on the ground outside the Hotel. Photo 16 - Collect the remaining photo scrap from the top of the gate leading to Mine and Forest - Talk to Rory.

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