• A phase diagram is a graph showing the conditions of temperature and pressure under which a substance exists in the solid, liquid, and gas phases.
  • At a sufficiently low pressure, the liquid phase does not exist.
  • Continually increasing the pressure on the liquid will eventually cause the substance to solidify.
  • The point labeled  is called the triple point.
  • The triple point is the one condition of temperature.
  • and pressure where theSolid, Liquid, and vapor states of a substance can all coexist at.
  • equilibrium.
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