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1.2.3 Molecular number density

As can be seen from Formula 1-4 and Formula 1-5 pressure is proportional to molecular number density. Due to the high number of molecules per unit of volume at standard conditions, it follows that at a pressure of 10-12 mbar, for example, 26,500 molecules per cm3 will still be present. This is why it is not possible to speak of a void, or nothingness, even under ultra high vacuum.

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