The point where pressure, p, and temperature, t, will diamond, graphite, and liquid carbon all exist in equilibrium is at
P=1*10^5atm
T=4300k
Generally, a situation in which opposing forces or activities are in equilibrium.
In conclusion, For a the cpd graph attached below, we consider the point where the three phases meet and hence consider equilibrum at
P=1*10^5atm
T=4300k
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