“Pirani gauge”的概念、定义、翻译、参考文献-科学参考

Pirani gauge

Physics

An instrument devised in 1906 by Marcello Pirani (1880–1968) 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.

Chemistry

An instrument used 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. The Pirani gauge was invented by Marcello Pirani (1880–1968) in 1906.

Electronics and Electrical Engineering

An instrument that measures low pressure by means of the variation of resistance of a conductor with pressure. An electrically heated wire loses heat by conduction through the low-pressure gas. The rate of heat loss depends on the resistance of the wire and if a constant potential difference is maintained across a wire, the change in resistance with pressure can be measured. Alternatively, the applied p.d. can be varied in order to maintain the resistance constant. The gauge must be calibrated against known pressures before use.

单词	Pirani gauge
释义	Pirani gauge Physics An instrument devised in 1906 by Marcello Pirani (1880–1968) 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. Chemistry An instrument used 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. The Pirani gauge was invented by Marcello Pirani (1880–1968) in 1906. Electronics and Electrical Engineering An instrument that measures low pressure by means of the variation of resistance of a conductor with pressure. An electrically heated wire loses heat by conduction through the low-pressure gas. The rate of heat loss depends on the resistance of the wire and if a constant potential difference is maintained across a wire, the change in resistance with pressure can be measured. Alternatively, the applied p.d. can be varied in order to maintain the resistance constant. The gauge must be calibrated against known pressures before use.
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