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## Main Question or Discussion Point

Just wondering, for van der waals equation, the real pressure is smaller than the ideal pressure and the real volume is smaller than the ideal volume?

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Just wondering, for van der waals equation, the real pressure is smaller than the ideal pressure and the real volume is smaller than the ideal volume?

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Borek

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Check - calculate P&V for several cases using both ideal gas equation and VdV equation.

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Borek

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This is a little bit convoluted and I have a feeling you are contradicting yourself - volume is less but you don't understand how it is bigger?Okay I found out that the real volume is indeed less than the ideal volume, but I don't get how the real volume is bigger than the ideal volume?

Ideal gas ignores molecule size, so at high pressures it theoretically compresses to zero, real volume is much larger than that.

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