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A '''phase diagram''' is a graphical way of showing the [[physical state]] of a pure substance at varying [[pressure]]s and [[temperature]]s. As seen in the image to the right, a phase diagram is typically represented as a graph with temperature on the [[x-axis]] and pressure on the [[y-axis]].<ref name="atkins">Atkins, Peter and Julio de Paula. ''Physical Chemistry Volume 1, 8e.'' Oxford University Press: 2006.</ref> | A '''phase diagram''' is a graphical way of showing the [[physical state]] of a pure substance at varying [[pressure]]s and [[temperature]]s. As seen in the image to the right, a phase diagram is typically represented as a graph with temperature on the [[x-axis]] and pressure on the [[y-axis]].<ref name="atkins">Atkins, Peter and Julio de Paula. ''Physical Chemistry Volume 1, 8e.'' Oxford University Press: 2006.</ref> | ||
| − | A phase diagram will always have a number of lines on it, representing a phase [[equilibrium]], that is, the set of temperatures and pressures at which one phase is in equilibrium with another phase. These lines are called [[phase boundary|phase boundaries]], and they section the area of the plot into the three phases of [[matter]] ([[solid]], [[liquid]], and [[gas]]) as well as the [[supercritical fluid]] region.<ref name="atkins"> | + | A phase diagram will always have a number of lines on it, representing a phase [[equilibrium]], that is, the set of temperatures and pressures at which one phase is in equilibrium with another phase. These lines are called [[phase boundary|phase boundaries]], and they section the area of the plot into the three phases of [[matter]] ([[solid]], [[liquid]], and [[gas]]) as well as the [[supercritical fluid]] region.<ref name="atkins" /> |
Along with the phase boundaries, there are two important points on a phase diagram: the [[triple point]] and the [[critical point]]. The triple point is the unique temperature and pressure at which all three phases of matter coexist in equilibrium. | Along with the phase boundaries, there are two important points on a phase diagram: the [[triple point]] and the [[critical point]]. The triple point is the unique temperature and pressure at which all three phases of matter coexist in equilibrium. | ||
Revision as of 20:46, September 29, 2007
A phase diagram is a graphical way of showing the physical state of a pure substance at varying pressures and temperatures. As seen in the image to the right, a phase diagram is typically represented as a graph with temperature on the x-axis and pressure on the y-axis.[1]
A phase diagram will always have a number of lines on it, representing a phase equilibrium, that is, the set of temperatures and pressures at which one phase is in equilibrium with another phase. These lines are called phase boundaries, and they section the area of the plot into the three phases of matter (solid, liquid, and gas) as well as the supercritical fluid region.[1]
Along with the phase boundaries, there are two important points on a phase diagram: the triple point and the critical point. The triple point is the unique temperature and pressure at which all three phases of matter coexist in equilibrium.