How do you calculate the percentage of volume occupied by the molecules themselves in an ideal gas?

as a proof that volume of molecules is negligible compared to the total volume of the ideal gasHow do you calculate the percentage of volume occupied by the molecules themselves in an ideal gas?
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The percentage volume occupied by the molecules themselves is not fixed, but depends on another variable (temperature or pressure).



For example, at higher temps the percentage occupied by the molecules themselves is lower. At lower temps, the percentage increases and eventually the ideal law fails and we have liquids.