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In thermometry, the standard fixed point is:


1. vapour point of water
2. ice point of water
3. boiling point of H2
4. triple point of water

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Correct Answer - Option 4 : triple point of water

Explanation:

  • The triple point of water has a unique value of 273.16 K.
  • At particular value of volume and pressure the triple point of water is always 273.16 K. Therefore triple point of water is used as standard fixed point in thermometry.
  • The melting point of ice and boiling point of water do not have particular values because these points depend on pressure and temperature

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