Aluminum foil is said to be not absorbing light at all. Can this WWII era rheostat be modified to dim an LED bulb? Another coin weighing puzzle, now including shifty coins! @BrandonEnright the foil is only on the outside of glass windows. Flow cells that contain The reason is that the metallic surface gets heated by the non reflected energy and radiates +transfers by contact. You might be interested in searching for "optical cavity" on the site. reply from potential PhD advisor? i.e. Aluminum—sputtered on glass 80% Aluminum foil 73% Stainless steel (various formulas) 20 – 28% A common material used in commercial UV disinfection systems is stainless steel. What's the implying meaning of "sentence" in "Home is the first sentence"? "BOMB DISPOSAL EXPERT. Would the UV wavelength be reflected along with the visible light, or would the foil absorb the UV? What is a halogen light bulb? But, it keeps the room warmer compared to the outside. "There are two common urban myths about fluorescent lighting and UV exposure. Does the shiny side of foil keep food warm? What is Time? Should we leave technical astronomy questions to Astronomy SE? The shiny side is produced when the aluminium is rolled during the final pass. First, there's no perfect reflector nor absorber. The unreflected light is absorbed and ends up in heating the foil itself. As I said air is a good insulator.If you stretch simple foil across the frame then there will be air in between glass and foil. Again an air gap will help keeping the heat in the room instead of heating the wall and radiating energy out. Aluminium foil has a shiny side and a matte side. Though the surface is shinny, I thought of covering the ceiling of the box with aluminium foil to reflect more of the light from the UV tube. If there was no light would Time cease to be? Thus, if you have an aluminum foil on a sun side of a wall you have to leave air between the wall and the aluminum so as not to get that residual heat heat the wall by contact. The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%. It depends where the aluminum foil is situated. The the residual non reflected energy will be mostly radiating out. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why do I need to turn my crankshaft after installing a timing belt? One more thing is that aluminium foils are designed in a way to reflect light. But, in reality (where we can't expect idealistic things), there will always be some radiation inside. What is the best way to remove 100% of a software that is not yet installed? Thanks. Then it would be a good idea to have a layer of insulator to the glass, so the contact of foil to glass is insulated thermally. For their metabolism to work properly they require UV light. Is solar energy the same as light energy? Does less shiny and more shiny actually make a difference? It often is metallic outside, then there is a layer of vacuum to stop contact heat transfer ( insulation) and then the container that needs to be kept cool. You can see from Crazy Buddy's answer that the more mirror like the surface the less is absorbed by the foil. It's only going to prevent direct sunlight to heat up the room. John Von Neumann. I believe Aluminium is highly reflective in the UV band. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. There ain'ta no sanity clause, and there ain'ta no centrifugal force æther. “Question closed” notifications experiment results and graduation, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…. Lovecraft (?) $\begingroup$ Then I'll just repeat what Martin Beckett said: aluminum is a decent reflector at 390-400nm as well as in the visible. If you see me running, try to keep up.". Insulation stops that transfer . First, is the type of UV you are using affective? Think of a dewar. So, does it mean that a more shiny aluminum foil will reflect more light and thus make the room more cooler as compared to less shiny foil? Please elaborate on where and how the foil is being placed. Bubbles (water) are transparent, then how can they produce white light in mass amounts? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. You will not get below this temperature using aluminium foil. @fffred The day time temperature here is 43 degree Celcius. Do other planets and moons share Earth’s mineral diversity? Response to comment (based on edit): That's a nice strange idea.