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🏠 Home › MCQs › General Science › Question

How many phases of water coexist in equilibrium at its triple point?

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By TheQuizWire

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Source General Science Knowledge Database

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Fact Checked

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Difficulty Hard

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Published 19 Dec 2025

A. Four (Solid, Liquid, Gas, and Plasma)

B. Three (Solid, Liquid, and Gas)

C. Two (Solid and Liquid)

D. One (Supercritical Fluid)

💡 Explanation:

The triple point is a specific temperature and pressure at which the three phases (states) of a substance—solid, liquid, and gas—coexist in thermodynamic equilibrium. For water, this occurs at 0.01 °C and 611.73 Pascals (0.006037 atm).

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