**Note that a phase diagram describes conditions and events in a closed system where no material can escape into the surrondings and air is present
The phase diagram of water is very different that the phase diagrams of other substances. One unique thing about water is that the boundary line between the solid/liquid sections has a negative slope, meaning that the melting point of ice decreases as the external pressure increases. This occurs because the the density of ice is less than the density of water, which is not true for other substances. For example, below is the phase diagram for Carbon Dioxide.
Note that unlike water the line between the liquid/solid
sections has a positive slope unlike water.
Below is the phase diagram for carbon. By defintition a phase diagram shows the different states that a substance could be in, and the temperatures and pressures at which it occurs. Carbon is different from the previous two because it can exist in different states as a solid:
The common graphite:
And the more expensive diamond:
The reason diamond is more expensive is because of its rarity, which is clearly evident in its phase diagram.
Below is the phase diagram for carbon. By defintition a phase diagram shows the different states that a substance could be in, and the temperatures and pressures at which it occurs. Carbon is different from the previous two because it can exist in different states as a solid:
The common graphite:
And the more expensive diamond:
The reason diamond is more expensive is because of its rarity, which is clearly evident in its phase diagram.
As shown in the phase diagram above it takes huge amounts
of pressure and temperature to form a diamond. While diamond can be formed
artificially, it is too expensive to compete with the natural stores of the
stones found in various parts of the world.
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