gaskalibreringstermometer

A gaskalibreringstermometer, often translated as gas calibration thermometer, is a device used to calibrate other thermometers by providing a known and stable temperature reference. It typically relies on the physical properties of a gas, often a noble gas like helium or argon, whose pressure changes predictably with temperature under constant volume.

The principle of operation involves enclosing a known amount of gas in a sealed container. As the temperature surrounding the container changes, the gas expands or contracts, leading to a measurable change in pressure. This pressure change is then correlated to the temperature using established gas laws, such as the ideal gas law. By precisely measuring the pressure, the temperature of the gas, and thus the calibration point, can be determined with high accuracy.

Gaskalibreringstermometers are considered primary standards because their temperature readings are derived directly from fundamental physical principles rather than being based on fixed points of materials that can degrade or change over time. This makes them ideal for establishing or verifying the accuracy of secondary thermometers used in laboratories and industrial settings. They are often used in high-precision calibration processes, particularly for achieving accurate temperature measurements over a wide range.