What is triple point of water? Mention the values of temperature and pressure at triple point of water

Explanation

The temperature of a substance remains constant during its change of state .
A graph plotted between temperature (T) and pressure (P)m of a subtance during change of state is called "phase diagram".

In phase diagram of water the P-T plane is divided into three regions.
The line `AO` is called fusion curve . It gives equilibrium temperature and pressure between solid and liquid states.
The line `CO` is called vaporisation curve. It gives equilibrium temperature and pressure between liquid and vapour states.
The line `BO` is called sublimation curve . It gives the reation between of temperature and pressure between solid and vapour states.
Triple Point: At point `O` the curves AO, BO and CO will intersect.
It gives the temperature and pressure at which solid, liquid and vapoures states of water are in equilibrium.
Coordinate of triple point of water a temperature `=273.16 K`, pressure `=0.006` atmos (or) `611` pascals.