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Physikalisch-Technische Bundesanstalt (PTB)

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Left: Conventional pressure measurement with a pressure balance according to pPB = Fg/Aeff (PB: pressure balance; g: gravitational force; Aeff: effective surface of a piston/cylinder system). Right: The new electrical approach: the relative change in capacitance C(T) caused by the measuring gas at a known temperature T, which is determined by means of a calibrated resistance thermometer R(T), can be directly linked to the gas pressure. The dielectric constant and the interaction of the gas particles enter into the required ab initio calculations: pab-initio(C,T, Gasab-initio)

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