Van de Waals Equation

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Van de Waals Equation

• Hongqun Zhang
• The Department of Physics, Beijing Normal
  University

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1. What is Van de Waals equation?
2. Derivation of Van de Waals equation
3. Significance of Van de Waals equation
4. Conclusion

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What is Van de Waals Equation?

• 1873 Van de Waals
• on the Continuity of the Liquid
  and Solid States
• 1910 Nobel Prize for Physics

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Derivation of Van der Waals Equation

• For one mole real gas
• For one mole ideal gas
• Volume Correction
• Intermolecular Attractions Correction

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Volume Correction
1mole
Where is a correction factor
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Intermolecular Forces Correction
.
Where is a correction factor
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For n mole real gas
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Significance of Van de Waals Equation

• Can describe the state of real gases and liquids
• Can describe metastable state
• Can describe critical point

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Conclusion

• Van de Waals equation can be obtained
• by modifying the ideal gas law with
• considering the size of molecules and
• intermolecular forces.