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The triple-point of water is a standard ...

The triple-point of water is a 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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Triple - point has a unique temperature, fusion point and boiling point temperature depend on pressure .
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NCERT BANGLISH-THERMAL PROPERTIME OF MATTER-EXERCISES
  1. Two absolute scales A and B have triple points of water defined to be ...

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  2. The electrical resistance in ohms of a certain thermometer varies with...

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  3. The triple-point of water is a standard fixed point in modern thermome...

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  4. There were two fixed points in the original Celsius scale as mentioned...

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  5. The absolute temperature (Kelvin scale) T1s related to the temperature...

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  6. What is the temperature of the triple-point of water on an absolute sc...

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  11. A brass wire 1.8 m long at 27 ^(@) C is held taut with little tension ...

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