Answer the following : The triple-point of water is a standard fi… - Vidyadip

Question

Answer the following : 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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Answer

Melting and boiling points of water aren’t considered as the standard fixed points because they vary with change in pressure, the temperature of triple point of water is unique and it does not vary with pressure.

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