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Polytetrafluoroethylene. Polytetrafluoroethylene ( PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and has numerous applications because it is chemically inert. The commonly known brand name of PTFE-based composition is Teflon by Chemours, [ 1] a spin-off from DuPont, which originally discovered the compound in 1938.
For example, the 50th percentile (median) is the score below (or at or below, depending on the definition) which 50% of the scores in the distribution are found. A related quantity is the percentile rank of a score, expressed in percent , which represents the fraction of scores in its distribution that are less than it, an exclusive definition.
Coupon (finance) In finance, a coupon is the interest payment received by a bondholder from the date of issuance until the date of maturity of a bond. [ 1] Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. [ 2]
Michigan (/ ˈ m ɪ ʃ ɪ ɡ ən / ⓘ MISH-ig-ən) is a state in the Great Lakes region of the Upper Midwest region of the United States.It borders Wisconsin to the northwest in the Upper Peninsula, and Indiana and Ohio to the south in the Lower Peninsula; it is also connected by Lakes Superior, Michigan, Huron, and Erie to Minnesota and Illinois, and the Canadian province of Ontario.
EC 50 is a measure of concentration, expressed in molar units (M), where 1 M is equivalent to 1 mol / L. The EC 50 of a graded dose response curve therefore represents the concentration of a compound where 50% of its maximal effect is observed. [ 4] The EC 50 of a quantal dose response curve represents the concentration of a compound where 50% ...
A liquid just alcoholic enough to maintain combustion was defined as 100 proof and was the basis for taxation. Because the flash point of alcohol is highly dependent on temperature, 100 proof defined this way ranges from 20% at 36 °C (97 °F) to 96% at 13 °C (55 °F) alcohol by weight; at 24 °C (75 °F) 100 proof would be 50% ABW. [2]
In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 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 duration.
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
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