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Because the acoustic gas thermometry reached 0.2 ppm in uncertainty, and Johnson noise 2.8 ppm, this fulfilled the preconditions for a redefinition. After the 2019 redefinition, the kelvin was defined so that the Boltzmann constant is 1.380649×10 −23 J⋅K −1, and the triple point of water became experimentally measurable. [11] [12] [13]
Noise figure (NF) and noise factor (F) are figures of merit that indicate degradation of the signal-to-noise ratio (SNR) that is caused by components in a signal chain.These figures of merit are used to evaluate the performance of an amplifier or a radio receiver, with lower values indicating better performance.
Friis's formula is used to calculate the total noise factor of a cascade of stages, each with its own noise factor and power gain (assuming that the impedances are matched at each stage). The total noise factor can then be used to calculate the total noise figure .
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As the electric field is irrotational, it is possible to express the electric field as the gradient of a scalar function, , called the electrostatic potential (also known as the voltage). An electric field, E {\displaystyle E} , points from regions of high electric potential to regions of low electric potential, expressed mathematically as
Electrostatic generator, machine to produce static electricity; Electrostatic induction, separation of charges and polarization due to other charges; Electrostriction, coupling between an electric field and volume of unit cells; Electrohydrodynamics, coupling in liquids between electric fields and properties
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