OT - yo! Nurses! help on this one

Can someone help me with this?
The measurements, cc and ml, are apples and oranges.
ml measures capacity
cc measures volume
Yet they appear to be interchangeable.  Are they equivalent?

The prescription says:
bottle contains 22.5 ml
Give 1.8 cc every day for 21 days.

Except, if they are interchangeable, that's only 12.5 doses.
And I did only get 12 doses from the bottle.
Can someone explain?  And can you also explain why they can't be consistent - ml or cc?

Kitty


If you have weeds, you don't have enough plants.

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