Phase Diagrams

# Phase Diagrams - • The line between the gas and solid...

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Phase Diagrams Equilibrium can exist not only between the liquid and vapor phase of a substance but also between the solid and liquid phases, and the solid and gas phases of a substance. A phase diagram is a graphical way to depict the effects of pressure and temperature on the phase of a substance: The curves indicate the conditions of temperature and pressure under which equilibrium between different phases of a substance can exist The vapor pressure curve is the border between the liquid and gaseous states of the substance o For a given temperature, it tells us the vapor pressure of the substance o The vapor pressure curve ends at the critical point . The temperature above which the gas cannot be liquefied no matter how much pressure is applied (the kinetic energy simply is too great for attractive forces to overcome, regardless of the applied pressure)

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Unformatted text preview: • The line between the gas and solid phase indicates the vapor pressure of the solid as it sublimes at different temperatures • The line between the solid and liquid phases indicates the melting temperature of the solid as a function of pressure o For most substances the solid is denser than the liquid o An increase in pressure usually favors the more dense solid phase o Usually higher temperatures are required to melt the solid phase at higher pressures • The "triple point" is the particular condition of temperature and pressure where all three physical states are in equilibrium • Regions not on a line represent conditions of temperature and pressure where only one particular phase is present o Gases are most likely under conditions of high temperature o Solids are most likely under conditions of high pressure •...
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Phase Diagrams - • The line between the gas and solid...

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