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  2. Law of reciprocal proportions - Wikipedia

    en.wikipedia.org/wiki/Law_of_reciprocal_proportions

    This ratio of 1.19 obeys the law because it is a simple fraction (1/3) of 3.58. (This is because it corresponds to the formula ICl 3, which is one known compound of iodine and chlorine.) Similarly, hydrogen, carbon, and oxygen follow the law of reciprocal proportions. The acceptance of the law allowed tables of element equivalent weights to be ...

  3. ISO 216 - Wikipedia

    en.wikipedia.org/wiki/ISO_216

    All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series ...

  4. Tape diagram - Wikipedia

    en.wikipedia.org/wiki/Tape_diagram

    A tape diagram is a rectangular visual model resembling a piece of tape, that is used to assist with the calculation of ratios and addition, subtraction, and commonly multiplication. It is also known as a divided bar model, fraction strip, length model or strip diagram.

  5. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In 493 AD, Victorius of Aquitaine wrote a 98-column multiplication table which gave (in Roman numerals) the product of every number from 2 to 50 times and the rows were "a list of numbers starting with one thousand, descending by hundreds to one hundred, then descending by tens to ten, then by ones to one, and then the fractions down to 1/144." [6]

  6. Trigonometric tables - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_tables

    In mathematics, tables of trigonometric functions are useful in a number of areas. Before the existence of pocket calculators, trigonometric tables were essential for navigation, science and engineering. The calculation of mathematical tables was an important area of study, which led to the development of the first mechanical computing devices.

  7. Enharmonic equivalence - Wikipedia

    en.wikipedia.org/wiki/Enharmonic_equivalence

    In Pythagorean tuning, all pitches are generated from a series of justly tuned perfect fifths, each with a frequency ratio of 3 to 2. If the first note in the series is an A ♭ , the thirteenth note in the series, G ♯ is higher than the seventh octave (1 octave = frequency ratio of 2 to 1 = 2 ; 7 octaves is 2 7 to 1 = 128 ) of the A ♭ by a ...

  8. Literacy in the United States - Wikipedia

    en.wikipedia.org/wiki/Literacy_in_the_United_States

    This article may need to be rewritten to comply with Wikipedia's quality standards, as article. You can help. The talk page may contain suggestions. (June 2024) First Lady Barbara Bush with New York City school children at the UNESCO International Literacy Day celebration in 1989 (the same year that the Barbara Bush Foundation for Family Literacy was launched) Adult literacy in the United ...

  9. Metabolic equivalent of task - Wikipedia

    en.wikipedia.org/wiki/Metabolic_equivalent_of_task

    The metabolic equivalent of task (MET) is the objective measure of the ratio of the rate at which a person expends energy, relative to the mass of that person, while performing some specific physical activity compared to a reference, currently set by convention at an absolute 3.5 mL of oxygen per kg per minute, which is the energy expended when sitting quietly by a reference individual, chosen ...

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