Ambiguous negative ion count

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Q.14 - What is the difference between (pcs/cc) and (pcs)?

A.14 -

[Ion density (pcs/cc)]
The amount of negative ions is generally expressed in (pcs/cc). It shows the number of negative ion molecules contained per unit volume, which is something like population density.

[Total amount (pcs)]
The total amount of negative ions can be expressed in (pcs). It shows the total number of negative ion molecules you actually absorb in a certain time frame. This unit is not popular because it is technically difficult to measure the precise amount.