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For accurate scientific work, temperatures are often measured by

  • A.Mercury thermometers
  • B.Alcohol thermometers
  • C.Platinum resistance thermometers
  • D.Thermoelectric thermometers

Answer: C

Accurate work uses platinum resistance thermometers.

Platinum's resistance varies with temperature in a smooth, highly reproducible way, and the metal does not oxidise or contaminate. The instrument covers roughly \(-260\) to \(960\) °C to about a thousandth of a degree, and defines the international temperature scale over much of that range.

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