Which combination of states does water co-exist with at its triple point?

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Multiple Choice

Which combination of states does water co-exist with at its triple point?

Explanation:
At the triple point, all three phases of water—solid (ice), liquid (water), and gas (water vapor)—are in equilibrium at the same time. This is a unique combination of temperature and pressure where ice, liquid water, and vapor coexist, so the state is simultaneously solid, liquid, and gas. For water, this occurs at about 0.01°C and 611 pascals. The other two-phase situations—solid and liquid alone, or liquid and gas alone, or solid and gas alone—occur along their respective boundaries on the phase diagram and do not involve all three phases at once.

At the triple point, all three phases of water—solid (ice), liquid (water), and gas (water vapor)—are in equilibrium at the same time. This is a unique combination of temperature and pressure where ice, liquid water, and vapor coexist, so the state is simultaneously solid, liquid, and gas. For water, this occurs at about 0.01°C and 611 pascals. The other two-phase situations—solid and liquid alone, or liquid and gas alone, or solid and gas alone—occur along their respective boundaries on the phase diagram and do not involve all three phases at once.

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