Define triple point of water. Why is it unique?

Boiling point of water

Define photolysis of water.

Define point dipole.

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)?

Give reasons for the following Rusting of iron is quicker in saline water than in ordinary water. Why is it so?

The standard boiling point of water is

Two absolute scales A and B have triple points of water defined to be 200 A and 350 B. What is the relation between T_A and T_B ?

Define freezing point of a substance.

Define water equivalent of a body .What is its unit?

What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale?