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  2. Permissible exposure limit - Wikipedia

    en.wikipedia.org/wiki/Permissible_exposure_limit

    Most of OSHA's PELs were issued shortly after adoption of the Occupational Safety and Health (OSH) Act in 1970. [1] Chemical regulation is sometimes [clarification needed] expressed in parts per million (ppm), but often [clarification needed] in milligrams per cubic meter (mg/m 3). [2] Units of measure for physical agents such as noise are ...

  3. Recommended exposure limit - Wikipedia

    en.wikipedia.org/wiki/Recommended_exposure_limit

    This TWA is calculated for a standard workday of up to 10 hours, over a 40-hour workweek. This is slightly different to permissible exposure limit (PELs), which are calculated for 8 hours over a 40-hour workweek instead. [1] NIOSH recognizes that certain scenarios demand more immediate attention and has therefore introduced additional measures.

  4. Exclusive: Quizlet acquires Slader as it aims to become the ...

    www.aol.com/news/quizlet-schools-reopening...

    The company raised a $30 million Series C in May 2020, bringing the company's post-money valuation to $1 billion. In the U.S., Quizlet is used by two in three high school students and one in two ...

  5. Dilution ratio - Wikipedia

    en.wikipedia.org/wiki/Dilution_ratio

    The following formulas can be used to calculate the volumes of solute (V solute) and solvent (V solvent) to be used: [1] = = where V total is the desired total volume, and F is the desired dilution factor number (the number in the position of F if expressed as "1/F dilution factor" or "xF dilution"). However, some solutions and mixtures take up ...

  6. Labeling of fertilizer - Wikipedia

    en.wikipedia.org/wiki/Labeling_of_fertilizer

    Fertilizers with additional macronutrients (S, Ca, Mg) may add more numbers to the N-P-K ratio to indicate the amount. The additional numbers are similarly reported in the oxide mass fraction form. The additional numbers are similarly reported in the oxide mass fraction form.

  7. Bowen ratio - Wikipedia

    en.wikipedia.org/wiki/Bowen_ratio

    The Bowen ratio is calculated by the equation: =, where is sensible heating and is latent heating. In this context, when the magnitude of is less than one, a greater proportion of the available energy at the surface is passed to the atmosphere as latent heat than as sensible heat, and the converse is true for values of greater than one.

  8. Cyclically adjusted price-to-earnings ratio - Wikipedia

    en.wikipedia.org/wiki/Cyclically_adjusted_price...

    The cyclically adjusted price-to-earnings ratio, commonly known as CAPE, [1] Shiller P/E, or P/E 10 ratio, [2] is a stock valuation measure usually applied to the US S&P 500 equity market. It is defined as price divided by the average of ten years of earnings ( moving average ), adjusted for inflation. [ 3 ]

  9. Lecithin–sphingomyelin ratio - Wikipedia

    en.wikipedia.org/wiki/Lecithin–sphingomyelin_ratio

    The lecithin–sphingomyelin ratio is a marker of fetal lung maturity. The outward flow of pulmonary secretions from the fetal lungs into the amniotic fluid maintains the level of lecithin and sphingomyelin equally until 32–33 weeks gestation, when the lecithin concentration begins to increase significantly while sphingomyelin remains nearly the same.