What is triple point & critical point

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Triple point is the temperature and pressure at which a substance can exist in equilibrium as a solid, liquid, and gas. Critical point is the temperature and pressure at which a substance's distinct phases merge into a single phase.

Triple point is the unique combination of temperature and pressure at which all three phases of a substance coexist in equilibrium.
Critical point is the temperature and pressure at which a substance's distinct phases merge into a single phase, known as the supercritical fluid.
For example, the triple point of water occurs at 0.01°C and 611.657 pascals, where water can exist as solid, liquid, and gas simultaneously.
The critical point of water is at 374°C and 218 atm, beyond which water exists as a supercritical fluid with properties of both liquid and gas.

What is triple point & critical point

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What is triple point & critical point