Draw a complete phase diagram for water. What is unique about water that makes it different from most other substances?

Question

 How could I daw a complete phase diagram for water.

What is unique about water that makes it different from

most other substances?

Answer 1

The phase diagram for water (https://www.google.com/search?q=phase+diagram+of+water&rlz=1CAHGDC_enUS811US811&tbm=isch&source=iu&ictx=1&fir=GoI2prdZeF_iIM%252CoJp-iAD9Lwvw5M%252C_&vet=1&usg=AI4_-kRDFrtk7FzAa1nAlPk3lCCzyTuDSg&sa=X&ved=2ahUKEwjw-9Xgqu_qAhWiJzQIHeFoCJoQ9QEwAXoECAQQLQ&biw=1536&bih=714#imgrc=GoI2prdZeF_iIM)

The slope of the line between the solid and liquid states is negative not positive. This means that its solid state is less dense than the liquid state (why ice floats on water).

Other reasons that make water unique: (1) very polar (2) has a high specific heat (3) can act as an acid or base