“Pirani gauge”的概念、定义、习题解题方法及翻译-物理辞典

单词	Pirani gauge
释义	Pirani gauge An instrument devised in 1906 by Marcello Pirani to measure low pressures (1-10^-4 torr; 100-0.01 Pa). It consists of an electrically heated filament, which is exposed to the gas whose pressure is to be measured. The extent to which heat is conducted away from the filament depends on the gas pressure, which thus controls its equilibrium temperature. Since the resistance of the filament is dependent on its temperature, the pressure is related to the resistance of the filament. The filament is arranged to be part of a Wheatstone bridge circuit and the pressure is read from a microammeter calibrated in pressure units. As the effect depends on the thermal conductivity of the gas, the calibration has to be made each time the pressure of a different gas is measured
随便看	second secondary cell secondary colour secondary emission secondary winding secular magnetic variation sedimentation Seebeck effect Seger cones Segrè plot seismic waves seismograph seismology selection rules selectron selenium cell selenology self inductance self-energy self-exciting generator self-organization self-similarity semiclassical approximation semiconductor semiconductor diode

物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。