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

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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In modern thermometry triple point of water is `273.16K`.
Melting point of ice and boiling point of water are not new because they change in pressure.
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