Using the phase diagram for #H_2O#, what phase is water in at 1 atm pressure and -5 C?

Answer 1

Clearly water is a solid phase under these circumstances.

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The phase diagram plots pressure (in #"mm Hg"#) against temperature. While the graph is non-linear, the normal boiling point, and the normal freezing point are clearly depicted when #P="1 atm"="760 mm Hg"#. The negative slope of #(DeltaP)/(DeltaT)#, which illustrates that ice FLOATS, is highly unusual.

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Answer 2

Caleb Adams

At 1 atm pressure and -5°C, water is in the solid phase, which is ice.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.