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  2. Body mass index - Wikipedia

    en.wikipedia.org/wiki/Body_mass_index

    This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Relative weight based on mass and height Medical diagnostic method Body mass index (BMI) Chart showing body mass index (BMI) for a range of heights and weights in both metric and imperial. Colours indicate BMI categories defined by the World Health Organization ; underweight, normal ...

  3. Intraocular lens power calculation - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens_power...

    The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...

  4. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Photopic luminous efficacy of radiation has a maximum possible value of 683.002 lm/W, for the case of monochromatic light at a wavelength of 555 nm . [note 2] Scotopic luminous efficacy of radiation reaches a maximum of 1700 lm/W for monochromatic light at a wavelength of 507 nm. [note 3]

  5. Units of textile measurement - Wikipedia

    en.wikipedia.org/wiki/Units_of_textile_measurement

    Textile fibers, threads, yarns and fabrics are measured in a multiplicity of units.. A fiber, a single filament of natural material, such as cotton, linen or wool, or artificial material such as nylon, polyester, metal or mineral fiber, or human-made cellulosic fibre like viscose, Modal, Lyocell or other rayon fiber is measured in terms of linear mass density, the weight of a given length of ...

  6. Wikipedia:Reference desk/Archives/Science/December 2005 ...

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

    How can one convert a .m4a file format (songs from iTunes) to *.wma file format (so i can play them in windows media player...)? There's a winamp plugin that lets it play m4a. So you can use winamp to play them, or you can use winamp to decode it to a wav (and then you can use any of a dozen programs to reencode it as an mp3) Raul654 10:58, 1 ...

  7. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    At 1 atm pressure, it reaches its maximum density of 999.972 kg/m 3 (62.4262 lb/cu ft) at 3.98 °C (39.16 °F). [ 54 ] [ 55 ] Below that temperature, but above the freezing point of 0 °C (32 °F), it expands becoming less dense until it reaches freezing point, reaching a density in its liquid phase of 999.8 kg/m 3 (62.4155 lb/cu ft).

  8. Graphene - Wikipedia

    en.wikipedia.org/wiki/Graphene

    Multilayer samples down to 10 nm in thickness were obtained. [ 2 ] In 2002, Robert B. Rutherford and Richard L. Dudman filed for a patent in the US on a method to produce graphene by repeatedly peeling off layers from a graphite flake adhered to a substrate, achieving a graphite thickness of 0.00001 inches (0.00025 millimetres ).

  9. Cigarette - Wikipedia

    en.wikipedia.org/wiki/Cigarette

    [176] [177] [178] Several factors go into determining the rate of each degradation process. This variance in rate and resistance to biodegradation in many conditions is a factor in littering [179] and environmental damage. [180] Discarded Newport cigarettes packs found in Olneyville, Rhode Island - 2008