Thermometer - definition
Thermometer - definition
Thermometer is a measuring instrument for determining the temperature of a body, substance or environment, based on physical phenomena in which a change in temperature produces a measurable change in another quantity such as volume, resistance, pressure, radiation or thermoelectric voltage. It is one of the basic Measuring Tools in life sciences, engineering, medicine and everyday life.
The construction and principle of operation of a thermometer depend on the temperature sensing mechanism used. Classical liquid thermometers take advantage of the expansion of the liquid (e.g. mercury or alcohol) in the capillary, while electronic systems rely on resistance sensors (RTDs), thermistors or thermocouples for measurement. Each of these methods converts a temperature change into an electrical, mechanical or optical signal that can be further processed, recorded or displayed.
Others thermometers can be calibrated in different units, most commonly degrees Celsius, Fahrenheit or kelvin (K), depending on the application and standards. High measurement accuracy and repeatability require consideration of non-linear phenomena, the influence of ambient conditions, and adequate compensation for the influence of other variables, e.g. humidity or pressure.
In modern systems, thermometers are often part of larger measurement and control systems, where they interact with microprocessors, A/D converters and communication interfaces. Depending on the design, they can enable local or remote measurement, operate in a contact or non-contact manner (e.g. infrared thermometers at ) and handle dynamic temperature changes in real time.
The applications of thermometers range from industrial process control, scientific research and environmental monitoring to domestic and clinical applications, making them an indispensable part of modern measurement technology.
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