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Convert 5000 cubic centimeters to mL and convert 3.5 L to cubic centimeters are of a type of conversion often seen. Cubic centimeters (cm3) is a non-SI unit, but it is in widespread use.
So, here is the rule to memorize: one cm3 equals one mL. Prety easy rule to remember, but many students forget it and teachers do like to ask this type of conversion on tests.
In the first example above, 5000 cm3 becomes 5000 mL and the second problem becomes "convert 3.5 L to mL." Then just replace mL with cm3 and the problem is complete (3500 cm3 is the answer, in case you were wondering.)
Hopefully that was pretty easy. Just remember, it stands a decent chance of being on the test.