The triple point of water is standard fixed point in modern thermometry. why? what is wrong in taking the melting point of ice and the boiling point of water as standard fixed points as was originally done in the Celsius scale?

The triple point of water is standard fixed point in modern thermometr

1.	The triple point of water is standard fixed point in modern thermometry. why? what is wrong in taking the melting point of ice and the boiling point of water as standard fixed points as was originally done in the Celsius scale?
Answer» It is because of the fact that triple point of substance unique, i.e., it occurs at one particular set of values of pressure and temperature. The melting point of ice and boiling point of water are not unique. They change with the change in value of pressure of due to the presence of impurities in water.

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The triple point of water is standard fixed point in modern thermometry. why? what is wrong in taking the melting point of ice and the boiling point of water as standard fixed points as was originally done in the Celsius scale?

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