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  2. List of countries by forest area - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    More than half (54 percent) of the world's forests is in only five countries – the Russian Federation (20.1%), Brazil (12.2%), Canada (8.6%), the United States of America (7.6%) and China (5.4%). [2] Many of the world's forests are being damaged and degraded or are disappearing altogether. Their capacity to provide tangible goods, such as ...

  3. Median lethal dose - Wikipedia

    en.wikipedia.org/wiki/Median_lethal_dose

    Median lethal dose. In toxicology, the median lethal dose, LD50 (abbreviation for " lethal dose, 50%"), LC50 (lethal concentration, 50%) or LCt50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test ...

  4. List of United States cities by population - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    50 states and Washington, D.C. This table lists the 336 incorporated places in the United States, excluding the U.S. territories, with a population of at least 100,000 as of July 1, 2023, as estimated by the U.S. Census Bureau. Five states have no cities with populations exceeding 100,000. They are: Delaware, Maine, Vermont, West Virginia, and ...

  5. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    Where s is the s-plane variable, ω is angular frequency and j is the imaginary unit.. Chebyshev filters. Sometimes other ratios are more convenient than the 3 dB point. For instance, in the case of the Chebyshev filter it is usual to define the cutoff frequency as the point after the last peak in the frequency response at which the level has fallen to the design value of the passband ripple.

  6. Rayon - Wikipedia

    en.wikipedia.org/wiki/Rayon

    Rayon, also called viscose [1] and commercialised in some countries as sabra silk or cactus silk, [2] is a semi-synthetic fiber, [3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [4] It has the same molecular structure as cellulose.

  7. List of countries by inflation rate - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    This is the list of countries by inflation rate. The list includes sovereign states and self-governing dependent territories based upon the ISO standard ISO 3166-1 . Inflation rate is defined as the annual percent change in consumer prices compared with the previous year's consumer prices.