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(D) The standardisation of thermometers is performed using a gas thermometer. Gas thermometers,particularly constant-volume gas thermometers,are consi

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Gas thermometer

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(D) The standardisation of thermometers is performed using a gas thermometer. Gas thermometers,particularly constant-volume gas thermometers,are considered the primary standard for temperature measurement because the properties of gases (like pressure and volume) follow the ideal gas law $PV = nRT$ very closely,providing a highly accurate and reproducible scale across a wide range of temperatures.

Standardisation of thermometers is obtained with

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