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Liters is the most appropriate measure.
Scientist would use milimeters.
millimetres (centimetres could also be used)
None of them. I would use litres. However, if you wish to use non-standard, obsolete units you could use "gallon".
Use trignometry
You would use Volume.
When the object is larger than the ruler.
A scale.
a ruler
Liters is the most appropriate measure.
Liters.
in math
ruler
You would use a balance to measure the mass of an object and a ruler or calipers to measure its volume. Density is calculated by dividing the mass of an object by its volume.
You don't measure with length. You measure the length of an object with a ruler. You would use inches or metres as your units.
g/cm3
I would place it in a container full of liquid after measuring the liquid. I would measure the amount of liquid displaced by the object. That amount is equal to the volume of the irregular object if it is fully submerged in the liquid.