A McLeod gauge is an instrument used to measure very low pressures, particularly in the range of 0.1 to 10^-6 torr (or approximately 0.1 to 10^-6 mmHg). It operates based on the principle of gas compression and relies on Gay-Lussac's law of gas behavior. The device consists of a small volume of gas that is compressed into a manometer tube.
OurBigBook Wikipedia Bot
Documentation