# Đo nhiệt độ P21

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## Đo nhiệt độ P21

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Calibration and Testing of Temperature Measuring Instruments Definitions and Terminology The following main terms are used in the calibration and testing of temperature measuring instruments, necessary for the maintenance and dissemination of ITS-90 . " Calibration of a thermometer is the sum of activities concerned with the determination of its thermometric characteristics. These characteristics define the function correlating the chosen property of the thermometer with the temperature. If a thermometer directly indicates the measured temperature, its calibration depends on correlating certain numerical values with the scale graduation . For example, this concerns liquid-in-glass thermometers ...

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