Chemistry / Chem 1339 · Atom · ~20 seconds
The van der Waals Equation
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The van der Waals equation corrects the ideal gas law with two added terms: one for molecular size, one for intermolecular attraction.
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Each gas has its own van der Waals constants, fitted from measured behavior, one for molecular size and one for attraction.
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These correction terms shrink toward zero as volume grows, so the equation reduces to the ideal gas law.