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A, or a, is the first letter and the first vowel of the modern English alphabet and the ISO basic Latin alphabet. Its name in English is a (pronounced / ˈ eɪ /), plural aes. It is similar in shape to the Ancient Greek letter alpha, from which it derives.

In heat transfer, the thermal conductivity of a substance, k, is an intensive property that indicates its ability to conduct heat. For most materials, the amount of heat conducted varies (usually non-linearly) with temperature. [1] Thermal conductivity is often measured with laser flash analysis. Alternative measurements are also established.

This is a list of Latvian football transfers in the 2016–17 winter transfer window by club. Only transfers of the Virslīga are included. All transfers mentioned are shown in the references at the bottom of the page. If you wish to insert a transfer that isn't mentioned there, please add a reference.

Many materials have a well-characterized refractive index, but these indexes often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers . There are also weaker dependencies on temperature, pressure ...

Catherine Jane Ford (born 12 May 1968), known professionally as Catherine Tate, is an English actress, comedian and writer. She has won numerous awards for her work on the BBC sketch comedy series The Catherine Tate Show (2004–2007), as well as being nominated for an International Emmy Award and seven BAFTAs.

A bulb-shaped modern retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage. A light-emitting diode ( LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing ...