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

1 Answer
Sep 28, 2016

Answer:

Clearly water is a solid phase under these circumstances.

Explanation:

See this site:

enter image source here

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.