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  2. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The equals sign (British English) or equal sign (American English), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation , it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the ...

  3. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    In fractions like "2 nanometers per meter" (2 n m / m = 2 nano = 2×10 −9 = 2 ppb = 2 × 0.000 000 001), so the quotients are pure-number coefficients with positive values less than or equal to 1. When parts-per notations, including the percent symbol (%), are used in regular prose (as opposed to mathematical expressions), they are still pure ...

  4. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    For example, rounding x = 2.1784 dollars to whole cents (i.e., to a multiple of 0.01) entails computing 2.1784 / 0.01 = 217.84, then rounding that to 218, and finally computing 218 × 0.01 = 2.18. When rounding to a predetermined number of significant digits , the increment m depends on the magnitude of the number to be rounded (or of the ...

  5. Sleep apnea impacts brain in ways that may affect cognitive ...

    www.aol.com/lifestyle/sleep-apnea-impacts-brain...

    Following the sleep test, participants were divided into three groups: those who had fewer than five sleep disruptions per hour or no sleeping issues those with five to 15 disruptions and mild ...

  6. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  7. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The quantity 206 265 ″ is approximately equal to the number of arcseconds in a circle (1 296 000 ″), divided by 2π, or, the number of arcseconds in 1 radian. The exact formula is = ⁡ (″) and the above approximation follows when tan X is replaced by X.

  8. Error threshold (evolution) - Wikipedia

    en.wikipedia.org/wiki/Error_threshold_(evolution)

    This is a population with equal number of each of 8 sequences. (If we had perfectly equal population of all sequences, we would have populations of [1,3,3,1]/8.) If we now go to the case where the number of base pairs is large, say L=100, we obtain behavior that resembles a phase transition .

  9. Blood alcohol content - Wikipedia

    en.wikipedia.org/wiki/Blood_alcohol_content

    0.06 – 0.2 0.62 60 – 200 Emotional swings, impaired vision ... Serum alcohol concentration is not equal to nor calculated in the same way as blood alcohol ...