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  2. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The number of decibels is ten times the number of bels (equivalently, a decibel is one-tenth of a bel). P and P 0 must measure the same type of quantity, and have the same units before calculating the ratio. If P = P 0 in the above equation, then L P = 0. If P is greater than P 0 then L P is positive; if P is less than P 0 then L P is negative.

  3. Web colors - Wikipedia

    en.wikipedia.org/wiki/Web_colors

    For example, consider the color where the red/green/blue values are decimal numbers: red=123, green=58, blue=30 (a hardwood brown color). The decimal numbers 123, 58, and 30 are equivalent to the hexadecimal numbers 7B, 3A, and 1E, respectively. The hex triplet is obtained by concatenating the six hexadecimal digits together, 7B3A1E in this ...

  4. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    The prefixes from tera-to quetta-are based on the Ancient Greek or Ancient Latin numbers from 4 to 10, referring to the 4th through 10th powers of 10 3. The initial letter h has been removed from some of these stems and the initial letters z , y , r , and q have been added, ascending in reverse alphabetical order, to avoid confusion with other ...

  5. Base64 - Wikipedia

    en.wikipedia.org/wiki/Base64

    For example, the hexadecimal representation of the 24 bits above is 4D616E. The octal representation is 23260556. Those 8 octal digits can be split into pairs (23 26 05 56), and each pair is converted to decimal to yield 19 22 05 46. Using those four decimal numbers as indices for the Base64 alphabet, the corresponding ASCII characters are TWFu.

  6. Analog-to-digital converter - Wikipedia

    en.wikipedia.org/wiki/Analog-to-digital_converter

    4-channel stereo multiplexed analog-to-digital converter WM8775SEDS made by Wolfson Microelectronics placed on an X-Fi Fatal1ty Pro sound card AD570 8-bit successive-approximation analog-to-digital converter AD570/AD571 silicon die INTERSIL ICL7107. 3.5 digit (i.e. conversion from analog to a numeric range of 0 to 1999 vs. 3 digit range of 0 to 999, typically used in meters, counters, etc ...

  7. Apparent magnitude - Wikipedia

    en.wikipedia.org/wiki/Apparent_magnitude

    For example, a magnitude 2.0 star is 2.512 times as bright as a magnitude 3.0 star, 6.31 times as magnitude 4.0, and 100 times magnitude 7.0. The brightest astronomical objects have negative apparent magnitudes: for example, Venus at −4.2 or Sirius at −1.46.

  8. Metrication in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Loose tomatoes for sale at a UK greengrocer in 2013, dual-priced in imperial (£0.99 /lb) and metric (£2.18 /kg) units. Signs like these do not comply with legislation, as metric prices must not be less prominent. [1] [2] Metrication is the act or process of converting to the metric system of measurement.

  9. Titanium alloys - Wikipedia

    en.wikipedia.org/wiki/Titanium_alloys

    contains 6% aluminium, 4% vanadium and 0.04% to 0.08% palladium. Grade 25 contains 6% aluminium, 4% vanadium and 0.3% to 0.8% nickel and 0.04% to 0.08% palladium. Grades 26, 26H, and 27 A hexagon formed from thermal stir welding of a Titanium alloy all contain 0.08 to 0.14% ruthenium. Grade 28