phase diagram

[datdat]

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I don't understand the following questions..
could anyone can explain why that answer is true?

1. if line a were widened to cover a range of temperatures, what would stae A have to be? -----it's amorphous solid not a pure crystalline solid...

2.phase diagram for H2O different to other diagrams in that line a slopes to the left

 

[whawha]

I don't understand the following questions..
could anyone can explain why that answer is true?

1. if line a were widened to cover a range of temperatures, what would stae A have to be? -----it's amorphous solid not a pure crystalline solid...

2.phase diagram for H2O different to other diagrams in that line a slopes to the left

2. Due to hydrogen bonding, solid (ice) is less dense than liquid water. One of the exceptions regarding the phase diagram. Think of the phenomena where you see ice floating in water.

 

[datdat]

yes,,but what i don't understand was..why the slope a (solid and liquid) should move to the left...