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The conversion of conductivity to the total dissolved solids depends on the chemical composition of the sample and can vary between 0.54 and 0.96. Typically, the conversion is done assuming that the solid is sodium chloride; 1 μS/cm is then equivalent to about 0.64 mg of NaCl per kg of water. Molar conductivity has the SI unit S m 2 mol −1.
The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.
where TDS is expressed in mg/L and EC is the electrical conductivity in microsiemens per centimeter at 25 °C. The conversion factor k e varies between 0.55 and 0.8. [5] Some TDS meters use an electrical conductivity measurement to the ppm using the above formula. Regarding units, 1 ppm indicates 1 mg of dissolved solids per 1,000 g of water. [6]
The term was coined by C.P. Steinmetz in a 1894 paper. [1]In some sources Oliver Heaviside is given credit for coining the term, [2] or with introducing the concept under the name permittance. [3]
The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...
Two-time Grand Slam champion Simona Halep, working her way back from a drug suspension, and Hall of Famer Lleyton Hewitt's 16-year-old son Cruz were among the players awarded wild-card entries ...
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millivolt 10 3 V kV kilovolt 10 −6 V μV microvolt 10 6 V MV megavolt 10 −9 V nV nanovolt 10 9 V GV gigavolt 10 −12 V pV picovolt 10 12 V TV teravolt 10 −15 V fV femtovolt 10 15 V PV petavolt 10 −18 V aV attovolt 10 18 V EV exavolt 10 −21 V zV zeptovolt 10 21 V ZV zettavolt 10 −24 V yV yoctovolt 10 24 V YV yottavolt 10 −27 V rV
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