Formula expression: (\ frac {{dP}} {{dT}} = \ frac {{\ Delta H}} {{\ delta v}}) where (dp) represents pressure change caused by temperature change, (dt) represents temperature change, (\ delta h) represents thermal change during phase change, (\)
Graphic expression: the lever principle of phase diagram can also be explained by phase diagram. Phase diagram is a diagram describing the phase change relationship of substances at different temperatures and pressures. In the phase diagram, there are usually phase change curves and points.
The phase change curve shows the phase change of matter at different temperatures and pressures. On the phase transition curve, matter is in an equilibrium state between two phases. The slope of the phase transition curve can represent the lever principle in the phase transition process. The greater the slope, the greater the pressure change during phase transition; When the slope is close to infinity, it means that the pressure change in the phase transition process is very sensitive.
The phase transition point indicates the point at which a substance undergoes a phase transition at a specific temperature and pressure. At the phase transition point, the two phases of matter are in equilibrium, and the changes of temperature and pressure will not cause phase transition.
Through the illustration of the phase diagram, we can intuitively understand the principle of the phase diagram lever. When the slope is large, the pressure changes greatly during the phase transition, and the phase transition of substances is highly sensitive to temperature changes. When the slope is close to infinity, the pressure change in the phase transition process is very sensitive, and even a small temperature change may cause the phase transition.
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