Cubic meters.
This would be measured in cubic meters.
yes
Formula is a geometry term. Formulas are used to measure area and volume.
volume
Celsius is the metric term for "temperature."
density
Any unit with dimensions of [ length3 ] is a unit of volume. Since the basic metric unit of length is the meter, the elementary unit of volume is the cubic meter. The metric units are now synonymous with SI units. The old CGS system is no longer recognised.
Use whatever is common in your country. In the long term, however, the entire world should switch to metric, for reasons of standardization, so if you happen to live in a country that uses non-metric units, you might try to push for metrification.
metric
No. It's a term like "length", "distance", "area", "volume", "radius", "diameter", "speed", "weight", etc. Any of those terms can be measured and expressed in any system of units.
The term milliliter is a measure of volume. Pure and simple. It is a cubic centimeter. We use volume measure on liquids (or, perhaps more properly, fluids). With water, a milliliter or cubic centimeter of this substance will weigh 1 gram. But that's only with water. Different substances will have different a different mass for the same volume.
The term premium volume is a measure of in-force business in a health insurance company. In-force business refers to the aggregate total of insurance policies which are being paid that a health insurance firm has on its record.