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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.
Thus in the past, megohm-cm was used, sometimes abbreviated to "megohm". Sometimes, conductivity is given in "microsiemens" (omitting the distance term in the unit). While this is an error, it can often be assumed to be equal to the traditional μS/cm. Often, by typographic limitations μS/cm is expressed as uS/cm.
The instantaneous discharge of the creek was 1.4 cubic feet per second (0.040 m 3 /s) near Pitman and 1.9 cubic feet per second (0.054 m 3 /s) at Line Mountain. The specific conductance was 199 micro-siemens per centimeter at 25 °C (77 °F) near Pitman and 188 micro-siemens per centimeter at 25 °C (77 °F) at Line Mountain.
Electrical conductivity can be expressed using a number of different units but the international standard is EC, and the unit of measurement is usually milliSiemens or microSiemens. The difference between these two units of measurement is the placement of the decimal point, so 1 milliSiemens is equal to 1000 microSiemens.
The specific conductance of the creek ranged from 274 to 313 micro-siemens per centimeter. The pH was slightly alkaline, ranging from 7.3 to 7.8. The concentration of water hardness in the creek ranged between 100 and 109 milligrams per liter. [8]
The g m of bipolar small-signal transistors varies widely, being proportional to the collector current. It has a typical range of 1 to 400 mS . The input voltage change is applied between the base/emitter and the output is the change in collector current flowing between the collector/emitter with a constant collector/emitter voltage.
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 specific conductance was 560 micro-siemens per centimeter at 25 °C (77 °F). [7] In one measurement in June 1993, the pH of Fidlers Run at its mouth was found to be 8.2. The concentration of dissolved oxygen was 8.8 milligrams per liter (0.0088 oz/cu ft) and the carbon dioxide concentration was 1.5 milligrams per liter (0.0015 oz/cu ft).