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Phase Diagrams
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At what specific conditions can water exist simultaneously as ice, liquid water, and steam?

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Choose the Best Answer

A

At the triple point of water

B

At standard atmospheric pressure

C

At absolute zero temperature

D

At the boiling point of water

Understanding the Answer

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Answer

Water can be found in all three phases at the triple‑point on its phase diagram, where the solid, liquid, and gas lines meet. At exactly 0. 01 °C (273. 16 K) and a pressure of about 0. 006 atm (≈611 Pa), the energy balance allows ice, liquid water, and steam to coexist in equilibrium.

Detailed Explanation

When the temperature and pressure are just right, ice, liquid, and steam can all be present. Other options are incorrect because Many think the normal air pressure lets ice and steam coexist; Some assume that zero temperature keeps all states.

Key Concepts

Triple Point
Topic

Phase Diagrams

Difficulty

easy level question

Cognitive Level

understand

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