What is the unit ml/g/um in mercury porosimetery?

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SUMMARY

The unit ml/g/um in mercury porosimetry represents the volume of mercury intruded per gram of sample per micrometer of pore size. The micrometer refers to the characteristic length of the sample, specifically the average pore diameter. The discussion also highlights the concept of "log differential intrusion," which simplifies the measurement to ml/g, indicating a logarithmic transformation of the differential intrusion data for better visualization and analysis.

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Salish99
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One of the outputs of mercury porosimetry is Differential intrusion in ml/g/um.
this is ml of Hg per g of sample per um of what?
What is that micrometer? The characteristic length of the sample, the average pore diameter or radius?.

Also, why is there a "log differential intrusion", for which the unit is ml/g. The um have vanished but what has been log-ed?

Thx.
 
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