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  2. Thin-film solar cell - Wikipedia

    en.wikipedia.org/wiki/Thin-film_solar_cell

    Thin-film solar cells, a second generation of photovoltaic (PV) solar cells: Top: thin-film silicon laminates being installed onto a roof. Middle: CIGS solar cell on a flexible plastic backing and rigid CdTe panels mounted on a supporting structure Bottom: thin-film laminates on rooftops Thin-film solar cells are a type of solar cell made by depositing one or more thin layers (thin films or ...

  3. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

  4. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    Common soda–lime glass, such as window glass, is partially transparent to UVA, but is opaque to shorter wavelengths, passing about 90% of the light above 350 nm, but blocking over 90% of the light below 300 nm. [32] [33] [34] A study found that car windows allow 3–4% of ambient UV to pass through, especially if the UV was greater than 380 ...

  5. Wikipedia:Reference desk/Archives/Miscellaneous/April 2006 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    The problem is that I was told to 'fratter' it -- pull it back and forth over an edge to soften the skin -- and I did this for more than two hours. It did get softer, but it still does not have that 'drape' quality that I'm looking for. I have seen, and felt, fur pelts that were completely soft and pliable.

  6. Lead - Wikipedia

    en.wikipedia.org/wiki/Lead

    Ingestion of applied lead-based paint is the major source of exposure for children: a direct source is chewing on old painted window sills. Additionally, as lead paint on a surface deteriorates, it peels and is pulverized into dust. The dust then enters the body through hand-to-mouth contact or contaminated food or drink.