air thermometer
Noun: * A device for measuring temperature: An air thermometer is a scientific instrument that determines temperature. It operates based on the principle that the pressure of a fixed volume of gas changes predictably with temperature.
The term "air thermometer" is used to specify the type of thermometer, distinguishing it from liquid-in-glass (e.g., mercury) or digital thermometers. It is primarily used in scientific, technical, or historical contexts. * The early scientists used a simple air thermometer in their experiments. * For precise measurements in the lab, an air thermometer is sometimes preferred.
- Constant-volume gas thermometer: This is the more precise, technical name for an air thermometer. It highlights its defining operational principle: the gas volume is held constant while pressure is measured.
- A constant-volume gas thermometer provides highly accurate temperature readings for calibration purposes.
- Gas thermometer: A broader term that includes any thermometer using a gas (which could be nitrogen, helium, etc., not just air) as the thermometric substance.
- Thermometer: The general category of instruments for measuring temperature.
- Constant-volume gas thermometer
- Gas thermometer (in context)
While "air thermometer" historically used air as the gas, modern precision instruments often use other gases like nitrogen or helium. The core meaning remains a thermometer that uses the pressure-temperature relationship of a confined gas.
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thermometer that measures temperature by changes in the pressure of a gas kept at constant volume
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