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) ?

The triple - point of water is a standard fixed point in modern thermo

1.	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) ?
Answer» SOLUTION :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.